Well, from a philosophical point of view, vegetarian movement is unfair for the plants

Plants that are responsible of lots and lots of human well-being and as life beings deserve to be treated with a similar respect that we use with other organisms.

Incidentally is also bad for human health

Yes, it is. Those articles that claim that you can live on a strict vegetarian diet without any bad consequences for your health are either lying, incomplete or based in pseudoscience. Is basically a religious movement.