I was in a LBRS run the other day on my paladin, decided to use heals. Dungeon was going pretty good. I'm confident in my ability to heal and took the time to learn what spells are useful for what situation (and use healbot for quicker button access). I've raided with priest and druid before, sometimes topping, and I'm pretty familiar with how healing is supposed to work.
First time I've run this place at the appropriate level (blitzed it at max before). We get to a boss (can't remember the name) that decides to polymorph 3 of us at the same time, including me. It seems like it must have lasted 6-7 seconds. The boss switched targets, and attacked a DPS, killing him in about 5 seconds, before I was even able to cast any heals (I was spamming the holy shock button to cast as soon as it broke, but it was too late).
It happened again, and the tank died this time. We wipe, and as we're running back, I ask if there's a way to avoid the polymorph mechanic. Nobody tells me anything. I find out that someone attempted to kick me. No, it didn't pass, but it told me that someone thought I was responsible for the wipe. I did everything I possibly could, and any healer would have had the same results (impossible to heal = they die). The next time we got lucky enough for me not to get poly'd, and the fight went without a single hitch.
Why do people immediately jump to blame the healer when someone dies? Why do they assume that it wasn't something they were standing in, or a mechanic they were unable to avoid, or worse yet, the healer was CC'd?
I know what I was doing (even though I wasn't familiar with the mechanic there, but should we be reading tankspot or some crap for old 5 man dungeons? No). There are a lot of bad healers, sure, but death isn't always their fault. Stop trying to blame them, it makes people not want to heal anymore.