Darth - we have Federal Marshalls, I’m 100% in favor of using their authority to arrest pedophiles.
There are a million in one areas where the Federal Government should get its nose out of, but I’m not sure shielding pervs is the place I would start.
If we do have Federal cops, I'm okay with them using their authority to arrest... well, anything they have authority to.
But, if the Constitution doesn't authorize a Federal police force (we may have one, but I'm not yet convinced that it is legally justified), then it doesn't matter I may want them to do.
There's a lot of stuff I think the Constitution gets wrong, or isn't clear about, etc. But it still needs to be treated as if it were the law of the land.