I have lost a lot of respect for the Douc Langur Foundation over this issue, with their wild talk of 'murder' and such.
We are talking about a perfectly legal transfer of 3 captive-bred primates from a zoo in Thailand to a zoo in the Czech Republic.
Will Chleby Zoo succeed with this species? We don't yet know, but the zoo is clearly making serious efforts to get the husbandry right. I wish them well and, if my health allows it, I hope to visit Chleby when the doucs have arrived and see them for myself.
(When Leipzig Zoo first brought in Chinese Pangolins, I recall there were some 'enthusiasts' who predicted the animals would be dead within weeks. Let's not be too quick to foretell failure at Chleby.)