Point taken, but as originally posted, I do youth football (7-18) in the main. I'm not really addressing vets or Sunday morning adult games. My role is as much educator as anything else, mainly of managers, tbh. Be clear and polite and tell them what they ought to be getting their team to do and they'll actually thank you in the long run; problems which may have arisen further down the line will then be nipped in the bud when they're running a team of 8-year-olds, or whatever. I am not trying to stop players taking part and looking to brandish cards for blue under armour with a red shirt - far from it. However, it's a learning process for those in charge and part of what grassroots football involves is actually bothering to read and adhere to the league's laws. All of this can be negotiated with a little tact and good sense.
Sorry to post again off-thread, so will leave it there. Hope this clears up what I was getting at.