The problem with taking away the throwing knife from the Infected is that it then becomes too easy for the non-infected. When Infected was first introduced without Throwing Knives, there was MOABs going off sometimes 2-3 times almost every single match, and the odds for the infected winning went down. We essentially seen the opposite of what we see right now. Infected winning becomes near impossible.

The system I would like to see however, would remove the Throwing Knife from the infected, but on a few conditions:

The first condition would be that the initial infected have a lot more health. As more and more players become Infected, the amount of health they have is lessened down to say, 150% normal health. Without the throwing knife, it's necessary to increase their health so that they actually have a chance at getting in close to the enemy.

Additionally, I would request that all ladders and areas that otherwise require the infected to "climb" and put away their weapon while doing so be taken away aswell. In maps like Dome and Outpost, it's far too easy to simply sit up on the catwalks and shoot the infected as they try to climb up, and the same is true for many other areas in the game aswell.

Only then would it become fair for the infected without their throwing knives. Otherwise, we're just going to be back at the initial problem of where nobody wants to be infected, they leave once they are, and enemies continue to drop MOABs all match, usually multiple times per match.