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 not like my kids aren't going to know they haven't been vaccinated. I'll raise them the way I see best, just as any other parent, but when they are adults they can make their own decisions for themselves. If *they* feel that it is too big of a risk to not be vaccinated and it fits in with their set of beliefs, then they can choose to get the vaccines any time in their adult life.