I wear a poppy to remember all of the fallen in conflict, regardless of how they were killed or what side they were on. I'm happy for the donation to benefit our own veterans with the RBL, but the act of remembrance itself is much wider than that for me. When I was in Afghanistan we held a remembrance ceremony every week, and the names of the fallen for that week were read out regardless of the flag they served under. The Canadians also use a poppy for remembrance, so it's not just us, and they also did some nifty poppy patches that were ideal for PCS - perhaps the RBL could consider that idea.
I think remembrance is more important than ever in a world where hatred and suspicion seems to be growing, but I fear that the real meaning of "we will remember them" and "lest we forget" are being lost.