Providing one is polite, and their main concern is the successful integration of someone into this board's community, I believe it's entirely reasonable to PM a person once or twice, point out where a post of theirs fell outside the board rules, and provide a constructive suggestion of two to help guide them back inside the rules.

That's basic mentorship 101.

If they continue to violate board rules (or even just basic netiquitte), then it's time to report it to the mods, without, as Jim mentioned, threatening the member (either publically or privately), or publically humiliating them by telling them in a public post that you've reported their post.

I've been either a mod or an admin on numerous boards for more than two decades. One of the responsibilities of being a mod is to do the same as above, but back it up with the consequence that if the poster doesn't comply with the rules after a stern warning, then they'll be either temporarilly or permanently banned, depending on the severity of their error.

To be perfectly transparent with you, can be very headstrong. I've been both temporarily and permanently banned from a handful of boards over the years, including having been temporarily banned from BAUT for crossing the line. Sure, it hurt, ego bruised and all of that. But I learned from it, and am a better netizen because of it. Not only do I have a couple of accountability partners who let me know, pronto, when a post of mine is out of line, but I'm doing a better job of policing my own posts.

BAUT, although an online community, is no different than any other community. Some members I know as acquaintences, others as friends, and a few as close as a real family member. In some online communities, like BAUT, law and order prevails. In others, chaos reigns. In most, it's a mix of both.

Contrary to what some people believe, the appropriate application of law and order brings freedom, while removing abusive behaviors that impinge on that freedom.

So, back to the OP, "should we snitch on tattle-tales?" I believe a polite PM is in order, but if it's a repeat, after the polite PM, then yes, it's time to contact the local sheriff (mod) and let them do what they signed up to do!

__________________
I am Mugs, of the Alien clan of Usa, Nordamerica, a Terran, of Sol.

Mine: "Perception isn't reality. It's merely an abstraction thereof, and quite often not a very good one at that."

Heinlein's: "Staying young requires the unceasing cultivation of the ability to unlearn old falsehoods." "Freedom begins when you tell Ms. Grundy to go fly a kite."