Response to 1. - Did you know that that even when imprisoned, only some of your rights are taken away? And upon release from prison, they are returned to you? All except one right, the only right that is the center of conversation through this comments section is the ONLY one that is NOT returned to a convicted felon. So with them not being able to own firearms, that is an infringement on their 2nd amendment right. And those people have it restricted because those people are deemed a threat to society. I am not sure what firearms you are referring to because to procure a weapon that is the same make, model, or of the same operation, you have to be specially licensed and have a background check which takes months.
So which firearms require further restrictions?
Response to 2. - Hammers drive nails, screwdrivers drive screws, vehicles transport people, bats hit homeruns. But they only do these things when they are picked up by a person. And they only do these things when they are used for their intended purposes. People bludgeon people with hammers. People stab people with screwdrivers. People crash into other people in vehicles. And people bludgeon people with bats. It is all at the choice of the person utilizing the item they handle. None of these things will do either the positive or the negative without a person picks them up. If you look at the statics on intoxicated driving deaths alone, this is a bigger argument for vehicle restrictions than the numbers being used for any further firearm restrictions.
As for you referring to suicides, if they want it to happen it will happen, the means that they about it is unimportant as long their intended goal is achieved. It is up to the people around that person to be in their life enough to notice the need for help and provide the support to them.