I agree with you on every other point btw, a red card is the right option. I would get absolutely no enjoyment from showing a red card for DOGSO to a 13 year old in the last minute of the game but the law is the law.There are two teams. You'll receive as much abuse for sending off as you would for not. I'd argue probably get more abuse for not sending off, in my experience.
However I don’t necessarily agree with this point. In my experience of refereeing, playing and coaching youth football, managers dont want to see a red card for technical offences. They’re happy to see cards especially for bad challenges. After all in my opinion the most important thing in youth football is keeping the players safe. But they don’t tend to want to see a red, and they’re not too bothered if it’s not shown. You should still show a cherry, I’m just warning of the consequences
In fact, story time from last season for my cousins U14 game I was watching, where home team are 2-0 up with 10 minutes to go. Corner kick, away player handballs it to stop it being 3-0. Clearly deliberate, clear DOGSO, clear pen, red card issued by the young ref, only for home manager to request it to stay 11v11. He argued there was 10 minutes left, and they were about to go 3-0 up, so a red wasn’t fair. With home manager and away manager not wanting him to go off, and the referee probably club appointed and knowing the home manager, he bowed to the pressure and rescinded the red.
As all these stories go, guess what happened. Probably the worst scenario for the ref, which always seems to happen. Home team missed the pen, away team counter attack and score, and guess who gets a last minute equaliser for the away team. Of all the players on the pitch, of course it had to be the one that should’ve been off. No idea what was said to the ref after the match but I bet home manager regretted blocking the sending off now