Eeeh, first one may not be that removed from actual risk. If we assume 1/10 of population is perverted, then cutting out hetero folks from perving on opposite sex is cutting that 1/10 to 1/100. So the chance some perv will actually go for it is lower. And this is a bigger issue for women than men, so makes sense to be watching out for that.

In USA that is, in EU we have full size stall doors and walls :|