Of course you can also eat vegan, without adhering to the animal rights ideology. Presumably even the fewest vegans support the position of animal rights activists.
Many people who change their diet do so because they do not feel complicit in the suffering of animals or for health and lifestyle reasons, or because they want to lose weight in this way. However, the activists of the animal rights industry successfully use the trend to “a conscious diet” to promote their goals and to donate to their organizations. They see the vegan diet as a political vehicle for their agenda and interpret the growing number of vegan-eating people as an encouragement to their position. Animal rights organizations such as PETA or Animal Peace also offer vegan recipes on their websites, which are often linked by vegans, so the spheres intermingle.