That's where we're going to disagree; as I said earlier "significant" is highly-debatable and subjective. I would deem sending merit to 200 alt accounts as significant enough to call it abuse, personally. I would also deem sending 50 merits to 4 alt accounts as significant enough to warrant abuse. 5,000,000 Merits would put you at the top of the most merited list for many years to come, which is also significant. Each scenario you describe, I would disagree that they are insignificant. I also see the rank of the accounts to be mostly insignificant when determining how abusive the situation is; although, maybe I am wrong for this criteria.
It is fine to agree with The Pharmacist and stand on a principal. I have no issue with this, and ultimately it is your choice what to do with your trust feedback anyways.
OP is being misleading about their situation though, because suggesting that you were tagged for simply having an alt account is incorrect. You were tagged for abusing the merit system, per the judgement of a DT member that has made their principals on the matter clear. Additionally you were tagged for cheating a signature campaign by the campaign manager, who also happens to be a DT member. You would be better served by contacting Yahoo directly to resolve and discuss the situation regarding the duplicate PMs. As for The Pharmacist, again you would have your best chance at redemption by simply carrying on towards a better path. Everything is negotiable, and I personally believe that The Pharmacist would reconsider their trust down the line once you are a stand-up citizen of the forum.