Why are some humans so angry they have to take it out on everyone? Especially the ones they're supposed to love?

who?

Not sure why.. Some people are born with explosive temperaments and have a short fuse...  Sometimes they have good parents who discipline them and so they acquire an amount of self control / discipline. and end up being relatively level headed people..  Nature then Nurture...  If both end up for the worse then things don't end up good for the person concerned or for anyone they have dealings with..