the one who raises their voice in public and then acts confused about why people are uncomfortable, the one who breaks things, says things, does things in the heat of the moment and then turns around with "you know I have a temper" like that sentence is supposed to close the matter.

So accurate, there is always that person that displays all these and then begins to wonder why people change.
And yeah, anger was never born with anyone, and as adults, its his/her responsibility to keep himself in check.