Who else are you putting to risk?

One answer I can come up with is your future grandchildren. By failing to innoculate your kids against measles, they could very possibly contract it as adults especially if they visit other countries. I know you will say it is a big "if", but in the event they get pregnant and have the measles, the birth defects can be pretty devestating.
It's hard for a gay man to feel bad about himself when his urologist asks him out on a date!