A rational reason for not professing opposition to the war on drugs is that you do not want to lose status. Surely your tests are for identifying contrarians?
"Not professing opposition" is different from supporting it. Sorry for not making it more clear.
If someone has no public view on the issue - that's fine. It's a completely different thing if they actively take the irrational view (like supporting it)
These two questions seem to be somewhat interesting, especially for those interested in rationality outreach.
What makes someone more likely to study rationality?
More likely to become a higher level rationalist?
A few thoughts:
Empirically, rationalists seem to be more into technical fields than average, and more interested in an explicit understanding of social things than most technical people.
People who can more clearly see deficiencies in themselves, and who try to solve problems seem more likely to become rationalists, when exposed to rationality.
People who are motivated to pursue rationality for instrumental goals, rather than for funsies, seem to become better rationalists.