Depending on what rightism is, for most it means minimum government, strong borders, national identity, meritocracy, freedom of speech. The right has done compromises my entire life. The idea that the right will choose insanity over sanity makes no sense to me.

Let me give you an example. You define rightism as elevated principles few disagree with. But even these noble principles have their limit. For example: lolbertarians often fight about whether the government has "the right" to police child abuse material, and they even try to justify because it increases demand and blegh. This is where "minimal government" collides with sanity.

Now, if someone told the right that they could either become full-on leftists and communists, or hold to that position... and they had to choose, they'd probably hold on to that position too! Just like if you told the left "you can't be a leftist and oppose open borders, race war, transgenderism"... they'd probably go with that.

What I try to do is to get leftists to be sane like that. Just imagine how great things would be if these subjects weren't on the table - honestly, I wouldn't care about politics at all.

I also see no compromise to be have about mutilating kids and allowing mass migration.

I agree. The compromise I propose is that leftists remain leftists while opposing transgenderism and immigration.

They also can't accept a compromise because by their own "logic" compromise equals nazi and without feeling morally superior the left has nothing.

Most leftists I know already agree with these things. The biggest leftist and Trump-hater I know also opposes immigration and transgenderism. The few very online idiots are not representative of people as a whole. It is perfectly possible to be a leftist while opposing abject lunacy.