There's an unsettling undercurrent of thought in the disabled community: "What if society decides I'm more trouble than I'm worth?" Some of their opposition to legalized euthanasia probably comes from that, and some from religious motivation.
Obviously neither justification is valid as a basis for making laws that apply to us all, but on the other hand, how do you tell them their concerns aren't worth listening to? Some cultures have practiced selective involuntary euthanasia in the recent past, so you can't say "It'll never happen."
