The U.S. has plenty of gun control and these problems are at a tolerable level and most of them dropping. Those which are not dropping will only get worse as citizens are dis-armed.
What is a tolerable level of gun crime, accidental gun deaths, gun suicides, and police shootings? That seems like a ridiculous statement. How much gun violence is okay in your mind? Is it tolerable until your kid accidentally shoots your wife? Is it tolerable until the cops start shooting at you? Where can you draw the line? I don't think any of those statistics should be tolerable. Everything should be done to get them as close to 0 as possible.
All your questions are things that gun control by government promotes. The difference is that government controls it all rather than everyday people controlling.
If you want to live free, you have to stand up and take responsibility for how you live. You control your guns with your kids all the time. You train your kids how to be responsible for their actions. You don't leave your guns lying around so your kids can get them without proper overseeing.
Gun control by government is simply all the crimes being done by government because government has the strength if they have the gun control.
