Well the bombs are predictable and the counter to them is not holding the button all the time, the knives you kind of get instakilled depending on the situation, because if you have a knife and gun close to you and then you attract the gun you get instakilled by the knife close to it which just seems unfair since you don't even realize why you died, also my strategy is to just stack guns on the ground and throw away knives that way I can always have a weapon and not get randomly instakilled