How do I enable low violence or censored mode in Team Fortress 2?
Unfortunately, you cannot remove all blood and gore from the game unless you reside in a country with these restrictions. Additionally, Steam Support cannot set your game to low violence mode. However, you can remove most of these violent effects from the game. Please see the two methods of doing so below.
Team Fortress 2 should now have minimal blood and gore.
You can also equip the Pyrovision Goggles ingame on every class for a similar low violence experience. If you wish you can combine both methods.
For more information on the Pyrovision Goggles and how to attain them, please see the TF2 wiki page here.