[swivelmaster]

Most things that are illegal have a victim. Murder, robbery, assault, etc. all have a responsible party and an injured party. Nobody expects that making murder illegal will stop all murders, that's a silly argument. You have to have some kind of justice, though.

This is why criminalizing drug use is such a unique and unusual case - when a person does drugs, there is no other victim, and yet the state punishes them for it anyway.

[tenebrisalietum]

Driving Under the Influence - you may have been pulled over and caught by the state without getting in a wreck. There was no injured party--yet.

[samatman]

Yes, reckless endangerment is a crime.

DUI recognizes, correctly in my opinion, that there are blood alcohol levels which constitute per se endangerment of others.