You seem really scared of drug dealers. Some of them might be involved with potentially very violent gangs, especially in certain areas, but that doesn't mean you're gonna get shanked as soon as you find out they have drugs or something like that.

Remember that a drug dealer's main goal when interacting with potential customers is to sell them drugs and make some money. If you don't pose a threat to them, it would be highly irrational for them to hurt you.

Also, it would only ever be even a little bit reasonable for a drug dealer to try mugging a customer if it meant they'd make more money than they lose; nobody will do business again with someone that mugged them.

This stuff would depend on your area, and there are some crazy people out there, but crazy people involved in loads of crimes generally don't last long themselves before the police or someone else they upset get to them.

Killing people is also a very difficult thing. Most people don't seem capable of murder, even if they like to make threats. I think there's also a lot of work and planning involved if you want to ever get away with murder.

Bare in mind too that guns are quite normalised in the US compared to most other countries. Particularly in certain regions, having a gun in your house is normal and can be perfectly legal.

Obviously I would never intentionally do anything I knew was against the law, but just think about what people's goals are and what they'd be likely to do. Most people are quite logical, and those that aren't often end up in mental hospitals.