Small correction to your post. It’s the 1934 NFA. You’re thinking of the 1932 Uniform Machine Gun Act which has been repealed or struck down as Unconstitutional in every state it was enacted in except Virginia.
Sound suppressors, silencers being a misnomer, are also the most effective muzzle brake available, if properly constructed, they have a significant positive impact on accuracy, especially over longer range.
There is no reason to have sound suppressors on the NFA. They need to be removed as do AOWs, SBR’s and SBS’s.
Roosevelt said that he would not support the law without the aid of the NRA. The original law included handguns along with suppressors and machine guns, and short barreled rifles and shotguns.
NRA Members (said to be lead by Elmer Keith) revolted against the handgun provision, and the NRA came out against it. That provision lost in the house by one vote, I am told. That is how close we came to losing the Second Amendment in 1934.
Roosevelt was our version of Mussolini, who was widely admired in “Progressive” circles.