It's akin to car-bombing a funeral; something only really insane or angry people do. And last time I checked, Stallman doesn't have much to be angry about.
There... uh.. seems to be a lot of difference between "god kills soldiers because gay people exist" and "software should be free." Even though his quip about Jobs's death was tacky, I'm still gonna give RMS more points than the Westboro Baptist Church.
There's a big difference between being tacky out of ignorance and immaturity and deliberately hurtful in a public forum with a measured audience. Coupled with a sense of timing and purpose, any sane and intelligent person would be able to make that distinction.
And much like a car-bomber at a funeral, what sets Stallman aside from the rest of us is the opportunistic cowardice with which he operates. If he truly felt harmed by Steve Job's actions whilst living, why didn't he make a case for him to die sooner rather than waiting for his death to be fait accompli?
As for opportunistic cowardice? Have you ever heard of RMS before? He's constantly saying these things, and to anyone who will listen (and some who won't).
Likening Stallman to a car-bomber is far worse than what Stallman actually said - you don't really have the moral ground to call someone else an opportunistic coward.