>Just to be sure to point out the obvious here, I think the main police effort should be on catching the sources of such material.

Uhhh how about both? It is vital the material be taken down as well.

Enforcement budget is limited. If you have $1, would you rather spend it to fight crime, or to chase whatever gets distributed online?

Sure, but let's prioritize catching actual criminals, right? Somehow US started completely ignoring the actual criminals and demanding platforms to play police and not try to punish the actual sources of lawbreaking.

I think they should catch the criminals as well, like I already clearly stated. They just aren’t mutually exclusive.