Dinosaurs tackled things with
ruthlessness and got away with it because it both looked kid friendly and not taken too seriously AND it flew that under the radar that no one actually had the chance to find anything controversial in it.
The show openly mocked Scientology! And it was so under the radar no one tried suing them.
But I take the "Happy Plant" episode as partially sincere, partially scathing. But on that level, they were far more accurate with their portrayal of pot than
anything else before it, especially this cartoon special. It showed everyone using it wasting their time, reacting to it as goofy (and in one case
very paranoid), and just not doing anything worthwhile since the plant was all they thought they needed. So yeah, in a way, they did have some sincerity about it.
But it also
brutally satirized networks
having to make these propaganda pieces (even though they had good intentions). The message at the end was one of the most bitingly brilliant in the show's short lifespan. Stop doing drugs or we'll have to have more preachy sitcoms telling you to quit.
And to think, this show lost in the ratings because of a show that had the same three mysteries every week.