@Vit246: There is no real world equivalent - so I'll try to make something up.
If you were born hearing voices, and feeling like something was trying to invade your body - you would have a very real world mental illness. A very terrifying experience made worse because the vast majority of people can't identify with you.
Now - let's also say you are born a pyromaniac as well. Another mental illness - this time, also very dangerous.
NOW - let's give you a flamethrower.
Maybe for a few months you don't hear the voices. Then - maybe you can block out the voices telling you to burn... Burn... BURN! But eventually - you won't be able to.
Now - let's say a doctor comes along and provides you with: "Illness be gone." You'll have to take it every day for the rest of your life at the most inconvenient times regardless of whether or not you want to.
Here is the questions:
If you chose not to take your pills - and you burn down a home with children in it - were you not selfish and irresponsible because you did not want to own the burdens you were born with?
Would you not want a known schizophrenic pyromaniac living next door to you to be FORCED to take his pills - even if he hasn't yet burned down your house?
====
The mages state over and over from DA:O to DA:I (and all the books in between) that they are always being challenged by demons - and, since they come with flamethrowers -
Do you not think they should FORCE themselves to take the proper training to make themselves safe to themselves and everyone around them?
The mages of Thedas show no signs of take responsibility for themselves - all they think about is having everything everyone else who ISN'T a schizophrenic pyromaniac has... plus, their powers.
THAT - is their "fault" in this mess.