Have you forgotten about Tony Stark blowing holes in people's heads and chests with his repulsors in Iron Man 3? Or the people on Air Force One who were shot and stabbed? Or "Mandarin" sucking **** for drugs?
How about Groot impaling his arms through 4 men and slamming their broken bodies into the steel corridor repeatedly? He also shoves his finger into Drax's chest so he can open up an airway. The way people's skin and bodies start to come apart while handling the gem etc.
Seems Fox is the one with a no bloody claws policy seeing as it took a Director's Cut just for us to get a hint of blood.