I don't know the laws elsewhere, but here in Europe trademark holders absolutely have the right to demand counterfeit products be seized and destroyed. Even if the owner acquired them in good faith. Also it would be interesting whether any compatible chips exist that use FTDI USB VID but were not marked with the FTDI logo.

Of course this kind of vigilante justice by FDTI is illegal, but who is going to press charges if that means they will get their devices taken from them and destroyed?