There are other accelerators and investors. Y Combinator can pick and choose anything. Your startup sounds very important but also incredibly challenging for any investor to get involved with. People in Silicon Valley may be pretty afraid of that kind of goal.

I would also be angry if they wouldn't give me five minutes, but that's not how their process works (imagine how hard that would be to personally say no to hundreds or thousands of people).

I hope you will continue to pursue other avenues for funding.