We do have some pretty quiet weapons, but not the sort you would want to take on a compound insertion mission.
On the suppressed MP5 that I got a chance to shoot once.
The loudest sound was the bolt and you would hear that in the next room (you may not know what the sound was, but you would hear the sound)
Besides, in Hollywood movies, do you notice that the bad guys who are shot with suppressed weapons always die quiet?
Well the real world is not like Hollywood.
People die noisily.