It's more than a strange irony. The very efforts of people like Craig to stigmatize homosexuality is what creates the conditions in which Craig found himself. Anonymous sex in airport restrooms in not unrelated to society's inability to accept homosexuality in American life. Craig is a victim of circumstances that he helped to create.
Gee, then why are Democrats adamant his only "crime" was being gay, instead of soliciting anonymous sex in an airport restroom? Do they care more about acceptance or cheap political points where they won't win anything anyway? Don't answer that.