I watch animal shows to learn about nature in its natural habitat. If they have to recreate some of it, as long as it is essentially true to nature, then i don't see an issue with it. If they showed polar bears juggling baby monkeys and tried to pass it off as natural behaviour that would be different.
claig the Daily Mail has an anti-BBC agenda as I think i have mentioned to you before. You will find that all wildlife programme makers, even National Geographic shows, will have similar practices.