[WikiEN-l] Newbie biting, the 3RR, and improper labeling of vandalism

[SPUI]

tl;dr version: three users including two admins revert-war a newbie past 
3RR; one of them blocks the newbie for it, and doesn't block one of the 
admins, who had also broken 3RR, because the edits - made in good faith, 
and possibly even good edits - were supposedly vandalism. The blocking 
admin insists he did nothing wrong.



Introductory links:
http://en.wikipedia.org/wiki/Special:Contributions/Mm555
http://en.wikipedia.org/w/index.php?title=U.S._Route_50&action=history
http://en.wikipedia.org/wiki/User_talk:Mm555

Rschen7754 and TwinsMetsFan are admins; O is not one on en.

Mm555 appears to be a newbie, or a former IP editor, from the Carson 
City, Nevada area. Among his edits, he edited [[U.S. Route 50]] to add 
junctions with US 395 and US 95 to the infobox, and was reverted a few 
times, in my opinion properly, since having that many junctions for each 
state would make it too big. A comment was added to the infobox: 
http://en.wikipedia.org/w/index.php?title=U.S._Route_50&diff=prev&oldid=156203841 
stating that there were enough junctions.

A discussion on the talk page: 
http://en.wikipedia.org/wiki/Talk:U.S._Route_50#Junctions_list_for_US_50 
basically agreed that US 93 is not a major junction and US 95 would be 
better; US 395 was brought up but not rejected.

Mm555, after reverting a change from US 93 to US 95: 
http://en.wikipedia.org/w/index.php?title=U.S._Route_50&diff=next&oldid=156558971 
decided that US 395 is better and changed to that: 
http://en.wikipedia.org/w/index.php?title=U.S._Route_50&diff=next&oldid=156559556

Personally, I think I agree; the US 395 and US 95 junctions are fairly 
close, and the US 395 junction is in Carson City, the state capital.

Rschen7754 reverted his edit "to good version", O made four reverts, and 
TwinsMetsFan made one. Mm555 ended up making five reverts. Rschen7754 
warned him several times for vandalism, and O threw in a "Please do stop 
and read the guideline" ( Wikipedia:WikiProject U.S. Roads/Infoboxes and 
Navigation/Infobox , which it doesn't look like anyone linked him to); 
it's also about the number of junctions, not which one to choose. Nobody 
told him about the 3RR and nobody pointed him to the talk page 
discussion. TwinsMetsFan blocked him for 3RR, but did not block O.

I confronted TMF and O on IRC, and TMF said he didn't block O because O 
was reverting vandalism. They claimed that Mm555's edits were vandalism 
because he wasn't following the consensus on the talk page.

What should be done about this? The blocking admin insists he did 
nothing wrong; I didn't get a chance to talk with the other admin, who 
gave most of the warnings. Obviously Mm555 should be unblocked and 
apologized to, if he's not already gone. But how do we prevent this from 
happening again?