In a way the Jedi Masters were right. Let me explain b4 u all kill me.
The exile didnt know of the potential he posessed so the Masters clearly told him with no grudge or any kind of fear inside.
The Masters held a larger view of the problem. If the exile would have any type of connection to the force then he would literally kill anyone and everyone.
they did the only thing possible that is not against the Jedi beliefs. they couldnt kill him so they permanently cut off the exiles connection to the force.
I know there are a couple things that can prove me wrong but ill leave those to you guys.