The Mexican government and especially Santa Anna were not even close to saints and were not primarily fighting the Texans for reasons of slavery. The Mexican empire carved out slavery as being explicitly allowed in the Mexican state that become known as Texas.

Mexico was about to end that carve out. But slavery was only one of the causes (and you're right about Santa Anna).

The myth is that Bowie and Crockett battled until their last breathes. The truth is that Bowie was sick and died in bed. Crockett gave up and was executed.

That's all from the 2021 book Forget the Alamo.