[Those are all very good questions--ones that Qui-Gon himself has asked time and time again. It was only when he personally experienced the destruction of anger that he fully realized the danger of emotions running rampant in the hands of someone who has access to the massive power of the Force and the darkness folded within.]

Your thoughts are heart are in the right place, and your questions are valid.

[Here comes the 'but...']

But there is danger in utilizing one's emotions as a tool. They aren't meant to be controlled in that way.

[He makes sure to keep his tone gentle and free of any accusation. Qui-Gon wants Ezra to feel like he can talk to him and bring up these challenges without the need to hop on the defensive. That would only serve to alienate the young Padawan.]