No, the good guy shoots the bad guy. There are vastly more good guys than bad guys. Why not let them have guns too?
The point is, this good guy and bad guy idea is just a Hollywood manufactured concept, that's how the fiction story lines run in their films. If you have open carry in a state and a guy walks past you with a loaded rifle over his shoulder, is he a good guy or a bad guy? Or is he a good guy with intent? If a good guy breaks the law, is he deemed a bad guy, or he only becomes a bad guy if he wants to harm you? If a good guy is in his house and a car pulls up because the teenage kids in the car are lost, and the good guy shoots at the car, is he still a good guy or bad guy?
So criminals have guns. So a serial shoplifter that has never owned a gun now doesn't fall under this criteria? But is he a criminal? Or do you sub-categorise criminals? America is a nation of serious binary thinking. Good guy v bad guy, all guns v no guns etc..
So what makes a good guy a potential bad guy. Well, you don't know in America because you give everyone the Right to Bear Arms. In many countries, you are first checked out. Police records, medical records, driving history, supplied referees checked, social media checked etc.. This makes sure that one can reasonably assume you would be responsible with a gun and thus you would then have a certificate to go buy guns. In other words, your "good guy" has nothing to fear about regulating who is responsible. Then to take the responsibility further, having loaded guns and loaded guns in public is not responsible. After target practice at the gun shoot, pheasant shooting, vermin control etc.. leaving a gun lying around at home or in the vehicle is not responsible. Securing it in a gun cabinet is a responsible action.
Why not let them have guns too? Who's banning guns? Gun regulations doesn't ban guns, it hopefully reduces those unsuitable from obtaining guns. It hopefully creates a safe gun culture. And that is only possible when the people want it. But those obsessed with giving everyone the Right to Bear Arms and not be Responsible to Bear Arms, America will continue to witness 1+ mass shooting a month. And don't think for one moment that changes in regulations bring overnight results, it takes decades and constant regulation tweaking.
With my clear background, I could easily join a local gun range, apply for a firearms certificate and go shoot an Uzi, but I have no interest, no bad guys are wanting to murder me, criminals on every corner are not wanting to violently mug me, and so on and so on with all these crazy scenarios gun nuts throw into the argument.
And if any good guy's reason to have a firearm is to simply have the maximum firepower to blast people away if they stepped on his land, then ask questions, THAT person is the worst person to own a gun.
And no, your government is not tyrannical.