They might be conducive to them, but they don't force bad decisions. Those are entirely the choice of the person in question regardless of how drunk that person is. Also the choice to take drugs in a certain environment is a choice of the individual. Like I said, drugs might make people more likely to make stupid decisions, but until those stupid decisions are actually made, that's immaterial. Love makes people do stupid things (knife the adulterer) but we don't prosecute love itself, we prosecute the foolish actions taken under the influence.