Drugs are never a mitigating factor, if one has control over whether of not he or she ingests them.
I didn’t intend to suggest mitigating behavior. Drugs have a casual relationship with bad behavior, which is why we are on a incredibly damaging path by legalizing them.
I’m sympathetic to the more libertarian take, that people should be able to do what they want, but there is a such a clear negative impact on places that legalize/decriminalize that we really need to stop.