He does want to make Mexico better. Just because he defended those who left Mexico to seek out opportunity in the US, doesn't mean that's all there is to him. He currently doesn't hold an office though, and even if he were president, drastic improvements can take months or even years for their full effect to be felt. Meanwhile, those who are suffering and desperate need something sooner than later, and some risk everything to come here to the US. He understands their plight, which is why he came to their defense, but that does not mean he thinks immigration is the solution to the problems Mexican citizens are facing.
He's making another bid for president, and I hope he is elected this time around. He's a progressive leader, and he's big on human rights: