Yeah, but not everyone has caller ID.
I dislike robocalls from anyone. Telemarketer, politician, pizza place, wwe wrestler (yes I've received them from a local pizza place and a wwe wrestler...I guess you could technically file them as telemarketers since they were trying to sell something. Anyways.)
Any charity who calls me, sends me crap in the mail, etc. is told that I will communicate with them when I so choose. I return all those address labels and crap. If they weren't shelling out thousands of dollars for that, maybe they wouldn't need so many donations.