Drunk driving is dangerous because your mental processes are slowed and your physical reactions are slowed. So if you make a bad decision that requires a quick reaction it is more likely to have a bad outcome. Driving tired or distracted are very comparable to being drunk because it also involves slowed thought processes and slowed reaction times.

Outside of driving it varies widely from person to person, and in general people tend to be more of who they really are because it lowers inhibitions and scales with the amount of intoxication for that person. It doesn’t give you ideas or anything, it just removes some guardrails from doing things you might be keeping from doing while sober.

People don’t cheat or start violence unless they were already inclined to do so while sober.