Yes, there was intel, my second step father was an agent collecting it. Yes, there were some tanks, though generally, they were ineffective. America 'allowed' it to happen? It was an international effort.

Leaving aside that they did have air support (and copious naval gunfire which was even better), reasonably good intel, tanks, and snipers, you might want to note that for a suicide mission, nearly all of the troops who went ashore lived and the mission was accomplished. Of about 160 thousand troops who landed on 6 June 1944 total casualties were about twelve thousand with four thousand of them being fatal. If you mean just the Pointe du Hoc action itself, the 225 men of the two Ranger companies did have heavy casualties. Only 90 of them were still able to fight after two days pf hard fighting - mostly in repelling German counter=attacks once they got up the cliffs.