The ban reason is indeed a horrible, shameful load of crap.
However, tking buildings and bleeding can make you look like a griefer. Furthermore, Saliva is pretty pro as far as things go, so unless he was doing it for the laughs, his build should have been fairly sane, especially if you're talking about armories on a repeater.
As long as you didn't kill the second to last node and/or last armory (in which case you could've been banned for malicious destruction of the base, aka. decon), the ban was far out of proportion IMO though, and yeah, probably worth looking into, especially considering saliva's response to this. A warning followed by either putteam spec, denybuild, and/or kick (but even that could be considered harsh) would've been more appropriate. You wouldn't happen to have a demo would you? If not, do turn on cl_autorecorddemo, its very useful in this kind of situation.
Finally, this should probably be in the official servers forum.