He...doesn't think Marcus would lie to him about this, under the circumstances (at least, not this direction: "deliberately leaving out the existence of cursed sapient cloaks" might be more plausible, as a temporary measure), but he is rather suspicious that someone might have been lying to Marcus.
:...and they're people?
What...do they gain, by being people? Such that Nature would have bred them for that, even though smarter animals are more susceptible to starvation all else equal (since you need more food to run more brain)?:
(He finds he wouldn't actually have been surprised by cursed mindless clothing: you could mix them in with your real grave goods to discourage tomb raiders. It's just another form of trap.
Cursed lesser-animal clothing, he could maybe see, as a sort of extension of bedbugs and lice.
But people??)
:--oh, or was it non-natural selective breeding?:
in the full breadth of history wizards may have done some horrible fucked-up shit with [running-mad-scientist-animal-breeding-programs-for-intelligence]† on cursed clothing, and felt they were acting rationally at the time
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†four syllables