There's no way that the Alik'r would come after someone for speaking out against the Thalmor. That is so ridiculous that Saadia deserves to be turned over just for treating the dragonborn like a gullible bumpkin.

Because the alik'r are still allowed to visit skyrim?

The truth is what Kematu says.

He's not a bad man, despite being scary.
He gives you a full story, credible evidence. All Saadia does is gloss over why they're after her, though genuinely scared.
And betraying your city to the thalmor is wrong, especially when they were so strong in their defence.

So I give her to Kematu.

I like the thalmor, but I prefer that hammefell was strong and willing to fight.

That kind of logic will get you in trouble in life