It's a weak weak excuse.
I've been solidy ripped many times, and I've never done anything really stupid (besides the being drunk itself that is).
When you are drunk, you are more likely to do things that you want to do, but when you are sober you think better of.
Being Drunk isn't going to make you suddenly become a psychopathic killer if you didn't have homocidal tendancies already.
Maybe you supress your stupidity better sober, but it's still there. Being drunk is a weak excuse.