there is no way of taking out a totalitarian government without the help of a military group or the actions of a paramilitary movement, one already have the gun power and the other is way more difficult to assamble than to find the guns. I'm from Venezuela and the goverment is still in power not because there are no guns but because at the end most of the people doesn't have the will to use them.
The problem with make it easier to buy guns, in any country, is that the victims are allways gonna be the people who doesn't have or never had the idea to use a weapon. There are allways the hot headed people that happens to decide to have a gun which for me is a pretty bad combination and can be easly avoidable by mental health tests before buying a gun.
That trully determined people to cause harm will find a way to get a gun, Yes, but at least make it hard for them...
What i do agree is that the security personel should always be armed, and it would be a good idea to have trained people in charge of the security of public places.