It is justifiable in the old way of thinking when youre talking about pitch counts... and stuff like the manager wanting his starter to "get the win" ... but when you look at pitchers tendencies to get hit harder the more they see hitters in a game(Happ is not immune to this), and it becomes even more defensible to get him the f*** out of there before the s*** hits the fan.
He was going through the order the 4th time, regardless of the pitch count he should have been taken out, thanked for his great day and let the pen work the last 6 outs.