A final warning, no less.
Yes, you're sitting on three recent warnings. I ignored old warnings, because they're old. Posting patterns, remember?
Because:
I solemnly promise that I will not entertain another "AATW doesn't understand that warnings aren't issued for singular posts" debacle. Further posts in which you pretend not to comprehend this will be considered as off-topic here.
Why is Pete allowed to accuse me of trolling in one thread and then warn me for opining that Tom is trolling in another?
Because it's my job to decide if threads need locking. I made the call, and I explained why. Yes, explaining moderator action is usually not on topic for the thread at hand. That, to most, should be blindingly obvious.
You should keep your "opining" to the relevant boards. If you become a mod, you will not only be allowed, but indeed expected, to explain your actions as you perform them. And yes, that would often involve acting on your assessment of the situation, and stating that assessment. Until then, you'll just have to accept that the "I was moderating the forum" excuse won't apply to your own off-topic posting.