Sorceress are much better than Henselt, Foltest or other kings - I think they truly had same intentions like witchers. Game tries to changes this idea, but I still prefer Lodge than kings, whom Geralt served.
Oh you mean oh so casually murdering 3000 people in one battle? Murdering Demavend and Vizimir which caused thousands of deaths as well as chaos and suffering throughout both countries?
No they aren't better morally wise ( if that's what you meant ). In terms of leadership? Maybe. As visionaries? Certainly.
As for siding with them, I don't think it will happen since Letho pretty much crushed any political power they had, but hey if they can do a turn around of the situation then sure why not?
That's what they say they want, what they really want is to be the greatest power like all other rulers.
What's wrong with wanting power to use it for the greater good? This myth in popular culture that the perfect leader is one who is hesitant about wanting power and using it solely for the good of his people is just hogwash.
When Phillipa says she knows to rule more then any king in Loc Muinne she has a point. What king was willing to create a nation with equal rights regardless of race in the witcher world, a nation based on meritocracy as well? The answer is none. Saskia was, but she would never be able to do so on her own ( nor did she despite what some Saskia fans might think, she had help from Phillipa from the start ).
In fact all the greatest leaders took power willingly and used it without hesitation. Even Jesus which we can consider perhaps the only true "moral" leader, ( and no this is not a religious argument, it's a historical one ) but even then he wasn't a political leader like Mohammed, Ghenkis Khan, Napoleon, Caesar, Augustus, Cao Cao and so on.
Desiring power is an important trait for any true leader, not some immoral attitude, what they then do with that power is what they should be judged on.