Leaving your rather bitter personal attack to one side......
After how many games is it appropriate? 5? 10? 20?
I am a firm believer that you either have the personal fortitude to make those tough decisions or you don't.....it's not something that can be taught or acquired. I'm not talking about knowing the correct sanction to apply under the LOTG, I am talking about the inner strength to be able to stand there in front of 22 semi-troglodytes who you know that at least 50% of them are going to be really upset with you for making that decision.....and doing it regardless, having the courage to defend your decision and stand by it.
Look at it in a slightly different way.....in your first game, you may not know what reaction such a decision will bring, you may still believe that footballers respect the referees decision, so the sudden outpouring of abuse, grief and other assorted dismay at your decision comes as a big shock, shattering your illusion of the "beautiful" game. So, when your next game comes around, you know that another such decision is going to potentially provoke another virulent reaction.....that's when your personal fortitude is needed...knowing you are going to get slated but doing it anyway.
So, if you're not prepared to do that, or think you won't be able to do that, then absolutely it's right that you should take a moment to consider whether refereeing is right for you. If you then decide that, actually, you are strong enough to do that, you might just find that your confidence has grown a bit, because you've taken stock of yourself, realised you are strong enough to deal with and next time around you find it easier to make that decision.
Yes, there is always a chance, someone might reflect and decide they aren't strong enough to handle those situation and quit......but is that not better than quitting after 5, 10, 20 games that they muddled through not enjoying their experience because they were too intimidated to give big decisions?