In a respectful way, imo, it would be negligent not to.
I share clips all the time with my team, on hudl, about this exact topic. The clip will pause.. "Player A, you have to make sure your head is up when you are making contact here" for example.
And, yes.. we've absolutely stopped practice to tell one of our kids "you can't hit like that" ... sometimes adamantly.
But, as a rule... and this does go back to when I started playing football/having my dad coach me.. (2001)...
1. Helmet is not a weapon, nor is it there to initiate contact. It is there as safety.
2. See what you hit. Always keep your head up.