It's because those shows get more ratings and views than the positive ones. They put up the popular shows that appeal to audiences.
If you don't support the shows that are positive for the hobby, you're pushing down the ratings and potentially being non-supportive of this hobby in general.
This is a show that helps to educate the public on the GOOD of these animals. Not all shows on AP are bad, but since you're stereotyping them all into one group, you're assuming that all the shows are filled with incorrect information. Animal Planet producers aren't herpetologists, they are looking for what appeals to the public. They may not understand what is more or less truth about this hobby because NO ONE enforces it.