What should he have done with them? Does he have deportation authority?
His State is in a severe crisis; it makes sense to send them to places which have claimed to want them.
As has been pointed out, he could bring Mexico to heal by heavily inspecting and slow-rolling all trucks coming in from Mexico.
But IMO this is likely a setup a la Jan 6, and Abbott is playing his part in it.
And shipping illegals from Texas through the country is indeed doing the globalists’ bidding.