While I may have some sympathy with the sentiment (being regarded on TZ as one of the pinko-leftie brigade), I think that is a bit strong and rather unnecessary.
Many members have been here a long time (much longer than you) and know each other to be very decent chaps. Many will already give to charities. I don't think you are required to "shame" members into giving as some kind of self-appointed forum social conscience.
Anyhow, I am happy to donate now, and will do so again. My choice.