I think it's a mixed bag. It seems like they were genuinely concerned about contamination that could harm the astronauts or others on the team, but not particularly concerned about other biological contamination. From the article:

> For example, the Apollo spacecraft hadn't been designed to prevent potential lunar contaminants from being exposed to Earth's environment; once it splashed down in the Pacific Ocean, the capsule's cabin had to be fully opened in order to let astronauts Neil Armstrong, Buzz Aldrin and Michael Collins out.

Another obvious "oversite" was that the "biological isolation garments" (BIGs) they wore were tossed into the open capsule door, and donned by the potentially contaminated astronauts! It's true that they were sprayed down with disinfectant afterwards, however the spray and whatever it washed off were drained directly into the ocean.