Reading your post I was really curious how many comments I can find below. Only the bravest ones? :-)
I can take the majority of your recent post as an advice and generally I agree with you. But I would like to remind you the other side of the coin. There's no clear guideline for newbies. Yeah, it's true, that you should learn as much as you can on the new world you're joining before you act. But to be honest, Steemit is the 'Promised land' for many people, and they will not read all the advice of experienced users. Can we really expect them to do this? I've been here for a month, I've been watching the ecosystem, I've been learning quietly. I don't think that everybody is so patient. Especially if we are speaking about money. Real money. People can lose their minds and they are trying the methods which are successful in other ecosystems. Should we really blame them?
My method is the ignorance. It's annoying if somebody is begging for an upvote or for following him/her. Ignore him/her! Maybe later on, he/she will have the experience and will stop writing stupid comments. You can notice them as you did in some of your examples. I've never flagged anybody although it was hard to resist the temptation. But as a rookie, sometimes a stupid comment is better than nothing.
Flagging is a punishment. We should preserve it for people who deserve it, by misusing the system. Spamming, fishing, cheating etc. Stupid comments should be ignored. That's the best way to teach them.