I think we're in trouble regardless of how we enforce it unfortunately.
I gave one for a block, where the defender had his arm shielding his face and handled it. They scored from the resulting free-kick, but woe is me, did I get so much complaining about that because "what is he supposed to do? Get hit in the face?"
And it isn't helping that players can be utterly stubborn at refusing to understand that there can be distinctions to offences; For example; They'll appeal all day for ball-to-hand incidents where the hand is at the side and get annoyed when one gets given because the defender went in like a half-starjump.
Yeah dammed if you do, dammed if you don't springs to mind
