I think this is a similar question to the one that came up around people boycotting Mozilla over their CEO (in fact, I think the whole "making lists of people with X political belief" was specifically discussed too).
My impression is that people seeking techniques for advocating political positions they care passionately about can sometimes fail to see the need to respect opposing viewpoints, and as a result begin to resent political freedoms that can often be more important than the issue.
A common example would be the KKK getting police protection for their marches in the US. It's something I'm totally in favor of, not because of any support for the KKK, but because society so greatly benefits when those political freedoms are reciprocated among everyone (in fact, it's exactly how we got the very social progress the KKK in this example stands against). Making lists of people with a particular political belief seems to me to have absolutely no purpose that isn't punitive in some way, and that's why I will always oppose it. History is too full of examples where the seemingly mild act of making lists of opponents ended in tragedy.
Back on topic though, I agree with Eagleon completely here. I wouldn't quite say Buddhism is as prone to violence as other religions, but I would say that any belief system whatsoever could be distorted and used to justify violence.
ninjafrumple fakedit:
I totally agree that sexual orientation discrimination surrounding employment is very common here in the US, but I think you're conflating the issue of that discrimination with the making of lists. I don't think employers ever vindictively share lists of known homosexuals just to avoid hiring them, for example, though I do know that some will go through other invasions of privacy like online history (which is horrible).