This comic brings up a couple of excellent points. The first of which is that science, even that most “pure” of sciences which is physics, is full of approximations, guesses, and hypotheses. None of which is to say that it isn’t good science, or reliable, or accurate. It just isn’t the pure and completely objective thing that so many people make it out to be. Observations, and therefore humans, are involved with all our concurrent foibles.
The second point is almost as relevant. It is the final question of the comic.