I posted this earlier, let me post it again...
What if incoming damage was so brutal that all DPS classes were given a heal ability or two...then expected to use it the majority of the time? Where they could only DPS a little, and if they weren't healing all the time people would yell at them? Would that feel right? Wouldn't there be yells that DPS should be DPSing? Cries of "If I wanted to heal, I'd have picked healer!", screams about lazy DPS who refuse to heal. If DPS were suddenly pressured into healing 75+% of the time I think there would suddenly be a lot more empathy. Or would all you DPS be perfectly happy being pushed into a healing role?
I'm not saying healers shouldn't DPS. Just trying to get people to understand the motive not to is not lazyness!