What the fuck is up with non-vegan leftists?

I've talked to many non-vegan leftists and they are the most puzzling type of person to me.

Like how are they even justifying participating in animal torture to themselves? All the things they critique about the brutality of capitalism could be applied them just easily! Somehow most of them seem incapable of entertaining the thought that perhaps actively and willfully engaging in the practices they themselves deem morally reprehensible is not the best course of action (gasp!) .

Every time I try to reason with them they pull same straw-grasping bullshit as liberals desperately trying to hold on to their unjustifiable beliefs -- it's the same arguments from them every time too:

• "no ethical comsumption under capitalism"
• "not everybody can be vegan"
• "unsustainable diet"

Do they seriously not see the hypocrisy or are they actually incapable of making a small sacrifice of their own happiness for the good of animals‽