I would add one more use for suppressors: training. While I am not a certified trainer (by any stretch of the imagination), I could easily see that suppressed rifles would be useful in training young shooters. The reduced noise would allow them to develop trigger control without developing the flinch that comes from the much louder (unsurpressed) bang.
A gunfight is not the time to learn new skills.
If you ever have a real need for more than a couple of magazines, your problem is not a shortage of magazines. It's a shortage of people on your side of the argument. -- Art Eatman