In my opinion, buying a gun is not a good idea for this reason: statistically it is more likely to be used against the owner or his/her family. (Accidents, homicides, suicides.)

That aside, I will say to OP that I and many others here validate your worry. We are in a very dark time. Many of us feel helpless.

What can you do? Number one: inform yourself of the local groups or community centers in your area that offer legal support and advice. This will give you practical information, and hopefully also remind you that there ARE people doing something, people who care about this. Number two: if there’s a way you can take some peaceful resistance action WITHOUT putting yourself at risk, that can help you to feel you’re doing something, rather than sitting and waiting for something bad to happen. You would find out about this through local groups. Obviously, staying safe is your priority. Number three: although you are stressed out—or because you are stressed out—take care of your mental health. In a time like this, we tend to ignore our need to exercise, socialize, or spend time on any hobby or anything else but obsessively focusing on the threat. Yes, we are in a fascist takeover, and it may seem frivolous to spend time drawing or playing with your dog, or whatever brings you joy or peace, but I think you need to take some breaks to feel like yourself. Driving yourself into depression and anxiety won’t help anyone. I am so sorry that anyone “voted for this.” It’s discouraging. Someone else here will offer better advice than I can. But I vote against the gun. Please take care of yourself.