What other things with a 90% success rate do you avoid?
It is perfectly valid to say “I’ve seen bad stuff with alcohol and chosen to not partake”, and it is also kind of deeply weird to say “I don’t engage in anything with a <90% success rate” and then not give any other examples.
A doctor told me that ~10% of people who drink become alcoholics.
That's too prevalent to say we " generally seem to handle it just fine"