Power, money and lying promises keep them there. More interested in staying rather than doing anything we voted them in for. The last 4 years have been wasted with the House and Senate. Trump can only do so much when he has no support from them.
Is there still talk about making suppressors to be sold and not being taxed? You know like car mufflers. It's more of a noise thing and hearing protection.
It's just a tool, just like wrenches and hammers, they have a purpose if used correctly. Only when you try to use the wrong tool for the job do you get in trouble.