I have seen many movies when I was young, none of which I remember the titles. This one is still stuck in my memory.
This thriller (or drama) movie is about a good father who lost his son because someone shot him at the gas station (I don't remember why). He decides to seek revenge himself on the person who killed his son (who belonged to a gang). He manages to kill him, but apparently the gang wanted revenge.
They go after the father's family, and shoot them all.
He goes back to kill the gang again, he kills them all besides one who will tell him something similar to 'Look at you. You're like us now'.
Seen this well-produced american movie after 2006.