They should be shocked about the tax stamp. It's a ridiculous requirement and it's good that it's finally going away.

As for them being common in Europe, that demonstrates the difference in culture and regulation vs. the US. I suppose if Europe had an NFA tax stamp equivalent that was being removed then the argument that they are a common sense safety accessory makes more sense but it doesn't in the US.

Hell, the same lobby and industry groups that have harped on the NFA would do the same if a suppressor was required to be able to shoot your firearm in the US.

The common problem so many gun enthusiasts in the US face is they try and argue need which just feeds the arguments from those who want to ban certain firearms or accessories.

The reality is need doesn't matter and is largely subjective these days. In the US it's been established that 2a gives the right to keep and bear arms and suppressors are considered "firearms" under the law. That means need isn't even a consideration. If you want one the you should be allowed to buy one because it's protected under 2a.

Edit: Common sense usually means a universally held, unspoken understanding and when it comes to the US, suppressors just don't meet that threshold. Enough time without the NFA tax requirement and that might change, but I'm guessing it won't.