Because I was the one who felt the need to be rude first, obviously. I also just explained EVERY PALADIN EVER not just specifically in Final Fantasy. Seriously, look here:
http://en.wikipedia.org/wiki/Paladin Also, your question wasn't "rhetorical", it was a thought you had ("Hm, that's strange, why do Paladins heal?") which would have been answered in 5 seconds if you chose to Google it or use your brain and figure out what I meant by my first post. It's also sort of annoying that you're comparing the job of being "a tank" with an actual, real life tank. Do you know any tanks in any RPGs or MMOs that do one insane burst damage hit every little while and then nothing else in between? What is the point of having a tank who both mitigates damage and can act as a DPS? Why would you use the other tanks, at all? Our JOB is to hold the boss and take as little damage as possible, not to output super max deeps. The closest you'll get is Warrior with Unchained and Berserk in FF14.
I honestly don't have any complex, if you weren't such a ding dong to my initial response I would've replied and explained calmly. But your response to any opposition is obviously "HURRR DURRR THEYRE NOT HEALERS WHAT ARE U TALKING ABOUT OMG GO AWAY", and on top of that you ignored the actual information in my second post and just went back to "Nah, obviously you're only talking about FF14 with this". Just. Christ.