Viggo Mortendubass has earned my money for acting in those three movies. I haven't been cheated in those transactions.
The guy is an intellectual lightweight, as is most of Hollywood, where the final product is an image on a screen. He's not yet a living legend, which means he still needs employment in his chosen line of work in the future. But he's had a starring role in one of the greatest movies ever filmed, and there's almost no chance that another movie of such scope will appear for another 20 or 30 years.
So his next job will be a major step down for him, as for the rest of the cast. In his case, he has to send the message to potential employers: "I still want to work, even though you and I both know your project isn't a pimple on the butt of Peter Jackson's work." He needs to keep his name in front of the Hollywood public, and continue to get the invitations to all the right parties and media events. So he has to adapt the right coloration, which includes antiwar, "green", and whatever leftist claptrap substitutes for reasoning out there.
I don't think he's got the brainpower to actually think through his position, but he's smart enough to know that, for him at least, his next meal depends on being accepted as part of the herd.
You nailed it, buddy! I suspect that's the case with a lot of the Hollyweird crowd.