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iirc the trust graph was permanent. decay happened to the extent that at every iteration, some trust "teleports" back to k00b, but every historical zap action you do has a permanent place in the trust graph, leading to smaller incremental trust changes for future zap actions.
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Not sure how it works now or did work but yea that sounds suboptimal. Might have a long streak of someone making great posts then all of a sudden they start affiliate marketing with that trust and you need to decay that trust as quickly as you built it.
Trust decay is a concept in WoT, cowboy hat streak might be just one metric in a larger WoT algo.