Whats the point of challenging calls if refs can't admit they're wrong

Draymond Green on going 2-of-9 from the FT line: Hopefully these coaches see this and start doing the Hack-a-Draymond and I can get some free points.

Injury Kristaps Porzingis calls for a sub and limps off the floor to the locker room

Nick Nurse goes wild on refs. Gets a tech. Kawhi: Unfazed