How comes this is a foul on Klay but constant off ball holds by Lowry, Green, and FVV is not

I want to quote Steve Nash one of the- Great player, great coach. He says Thats not basketball

Kawhi with the no-look pass out to Green in the corner, who sinks his fourth three of the game to put the Raptors back up by 16

Down 3-1 to Golden State, a desperate Trevor Ariza pulls out all the stops and knees Klay on the head

Kyle Lowry: "We brought it home, baby!"