Hands in the air, I don't know the nuances of the PIP issue. To say she is cruel, you would have to know the choices available to her. To be fair, amending benefits is very complex.
I don't like this iteration of Labour. They have a number of faults but I do believe they are acting like adults, which makes them an improvement to any government post 2019. However, I do not see them as nasty at all.
As for having no sympathy, I would reserve that for evil of the likes of Hitler, Pol Pot, Putin etc.. I think you may be overreacting a tad. The irony is that you have no empathy for her supposedly lacking empathy.