Human psychology. People will naturally believe things that are akin to their own political or life views. Even if they previously detested someone. Once that person validates their own opinion they forget that.
You only have to look at some of the people attending protests of different sorts. Certain speakers or organisations that normally have very different moral standards. Suddenly appear together. Even if one group are racist or abusive. That is justified in the heads of other protesters because they are now marching for a common goal.
My own opinion is similar to the article in the i newspaper yesterday. I think it was called liar liar. Both sides are liars 🤷♀️