Gun Control

I live in Ohio so I hear ads about background checks not existing and that I should contact Senator Rob Portman about keeping guns out of the hands of criminals and mentally by having laws requiring background checks.

The ad sound reasonable on the surface until you think about what they are saying being out right silly.

Criminals are criminals, so what's going to force them to purchase a gun legally?
Mental ill status checks requires to infringe upon the applicant's private medical history, right?

What constitutes someone as being mentally ill? Perhaps having PTSD? A lot of victims of violence suffer from PTSD, but a number of other things can cause anxieties related to PTSD. Thus begging the question, will a doctor's note be needed to apply for a fire arm? (Like doctors have time to be part of the process.)

Even if another gun is not manufactured, there's how many guns already in circulation? How many of the 310 million guns are illegally owned? How does one go about rounding undocumented guns? Why not worry about the illegal guns already in existence? Seems like only law-biding citizens get any scrutiny by these proposed background checks.

It's silly to think that having comprehensive background checks will end gun violence when there's so many guns already out there in circulation. Why not profile those who are prone to violence and give them attention they need before they become infamous? How many of these mass murderers were "weirdo loner" types? How many murderers grow up abused or neglected? Why not focus on what's driving them to violence or apathy towards others?

I'm all for keeping guns out of the hands of the mentally ill and criminals, but the argument being given in the radio ads is silly and naive to a cynic like me.