Why the hell would anyone vote for Herschel Walker of Marjorie Taylor Greene?

It's not cowardice, it's cynicism. 

People may tell pollsters that they support sensible controls over gun ownership, but they do not vote based on those beliefs.  This fall, a significant amount of people who ostensibly support gun control will vote for Republicans because they are unhappy about inflation and gas prices.  By contrast, the gun nuts tend to be single issue voters who will vote against someone who supports gun control regardless of any other factors.

Until the voters start punishing candidates for their support for completely unrestricted gun ownership, no one in Congress is going to do anything about the problem.

"So I asked them when the next time Bernie Sanders or AOC stand before you and asks for your support for Medicare for all and Universal Healthcare…so mental health services can be made WIDELY and EASILY available to the populace, we can expect their support and votes."

Unfortunately, its not that simple.  As has been pointed out by others in this thread, there are MANY overlapping problems contributing to this situation.

I am on the board of a non profit that provides mental health services to children in the Clark County School District, which comprises all of southern Nevada.  

We operate clinics onsite at 15 schools, and we have two off site clinics.  We will treat any child (and their family members) who are referred by the District.  If the child has health insurance or Medicaid, we will bill those entities, but there is no deductible or co-pay, so there is never an out of pocket cost to the patient.  If a patient does not have insurance, treatment is provided for free.

If it were up to the District, we would be at 300 schools.  The problem is there are not enough licensed clinicians (or clinical interns) in the state of Nevada to meet the community's needs.  That is true in many states.  

Consequently, if we had universal healthcare tomorrow, mental health care would still not be widely and easily available to everyone who needs it.

Personally, I don't think the mental health component of this problem can be solved by the government alone.  

There is a video on YouTube featuring Simon Sinek, talking about the challenge of managing millenials in the workplace.  I recommend that every parent and grandparent watch it.  Sinek very insightfully discusses the reasons why this generation is failing to develop the coping skills possessed by previous generations.

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Millennials are in their 40s, and older folk are still trying to argue that they can't cope in the workplace. While I do think Gen Z and Millennials have issues with instant gratification, I think the issue is less that they lack coping skills and more that they are less in denial about the issues. I was just having a conversation with my mom about how some of the things that we consider child abuse today were normalized as regular parenting in her generation and how her generation was blind to the ways they inflicted trauma on their children and blind to their own trauma.

I'm more concerned about the coping skills of those police officers.

This is a hopelessly naive take. Any significant action would likely be immediately halted one of the conservative circuit courts and eventually be kicked up to a Supreme Court that is currently anti-gun control.

People are watching violent movies and TV shows worldwide. People are playing Call of Duty and Grand Theft Auto worldwide. Yet the US is the country having issues with gun violence. If entertainment is the same across the globe, but gun availability and attitude toward gun ownership is particular to the US, where do you think the issue actually lies?

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Ironic how you're already making excuses for Biden and nay-saying changes to violent forms of entertainment - clearly you think guns are cool and entertaining.

It's not just the gun-nuts stopping change.  Gun-nuts are more likely to sit and negotiate ways to keep as many guns as they can.  People who think serial killers are entertianing, watching people shoot each other and then have Jessica Fletcher solve the murder in 45 mins --these people need to re-think what they're willing to give up to change the group think.

Your mileage may vary

Japan, just to put an example, has BY FAR the most violent entertainment in the world and they have like, 8 murders a year or something.

But what is incredibly hard over there is getting your hands on a gun (even for the Yakuza).

The entertainment thing has been proven to be a non-issue over and over again and is only used by wannabe censors (quite cynically I might add) to distract from the real issues.

I fucking hate guns and had a friend murdered because there was a gun in her house. But thanks for displaying your fallacious arguments and lack of critical thinking. 

Why don’t you answer the question posed? The popularity of violent entertainment is a worldwide phenomenon, so why is America’s gun violence not a worldwide phenomenon?

Perhaps because there’s no causal relationship between violent entertainment and gun violence? That couldn’t be it.