What I'm trying to say with that is that it's not an equal comparison. There is no political mobilization for extreme left ideas that is even remotely comparable to the far-right that align with some narratives that the students obviously consider as dangerous, such as anti-Islam and anti-immigration, anti-LGBTQ, and pro gendered labor division.
I am not in favor of flat out banning such books (even if I personally believe they have no place in an environment of science and learning such as a university), but it's easy to understand why the response of left-leaning students towards right-leaning topics is stronger than the inverse.