To be fair, suppressors aren't really illegal. 39 states allow private ownership, and of the remaining, two require an FFL to own them.

In all cases we just need to pay for a "tax stamp". So it isn't really illegal in all that many states. There are a LOT of gun laws here in the states, and a large percentage of people don't know what they are or that they even exist in the first place. Regulation here is actually very very strict, often with zero tolerance policies and minimum prison sentences.