If you use guns as fireworks, it can put the people around you at risk. Gunshots can usually lead to people thinking of danger, so in this case, if someone heard gunshots, they would call the police. This can be bad for the person abusing the gun because when the police arrive, you look guilty shooting a gun, and you can say it was just for fireworks, but there is not much suitable proof behind your reasoning.
People often distrust strangers because when we grow up we are taught stranger danger and how not to trust strangers so when we live through life this is just an impulse that we have