Tackling is a difficult thing to teach. If you practice full speed tackling, players get hurt. Form tackling can only take you so far but that’s what players/coaches do. And the rules are such that it makes it more difficult, particularly on the QB. Can’t hit him late, can’t hit him high, can’t hit him low (maybe that’s just the NFL), can’t sling him down, can’t shove him down, so WTH you gonna do?
On a regular ball carrier, you go to tackle him and he ducks low and you get a targeting call. It’s all arm tackling now except for the times a defender is lucky to get a shoulder in there.
I know, we got got to be safety conscious. But it sure puts a thorn in the side of an aggressive defender. No more room for players like Butkus, Lambert, LT, Nischke, Curtis, Bell, Nobis, Huff, etc.