Ben 10: Ultimate Alien, Season 1

Grandpa Max:
Kevin's a menace. Your friendship aside, the only responsible move is to take him down with all necessary force.

Ben Tennyson:
Then I don't understand why you're talking to me.

Grandpa Max:
It's the logical move. It's the safest move. It's the sensible move.

Ben Tennyson:
But?

Grandpa Max:
It's not the Ben move. You trust people, you give them second chances, and they live up to your expectations. Kevin was a sociopath when you were kids, but you trusted him anyway.

Ben Tennyson:
Look how that worked out.

Grandpa Max:
He's turned into a fine young man - a hero a dozen times over.

Ben Tennyson:
But now he's a monster.

Grandpa Max:
True - and I'd put him down like a mad dog - but I never thought YOU would. You always find another way.