I have been to plenty of walkthroughs with tamarins and inside none-walkthrough enclosures for tamarins as a keeper too. Aggressive behaviour has never been an issue.I don't even know why people think tamarins would be good walkthrough animals, irl they are quite aggressive and territorial against humans, normally biting and scrathing if someone comes to close. That's just walkthrough giant anteater level of dumb.
As long as you don't touch them or treat them like domestic animals, it is all good. I have heard more stories about lemurs biting people than tamarins/marmosets, and nobody questions them as walkthrough animals.
Edit: I might need to point out, I'm team tamarins in habitats.
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