I doubt there would be any companies that own the refineries that would stay in TX at the risk of losing all the business they do in the rest of the US. TX would be a dystopian nightmare to live in if they did leave the US. No national company is going to stay, all the military bases and defense industry would be gone, no products will be delivered from other states for as long as it would take to figure out passports and immigration back into the US, the airports would no longer have FAA oversight, and a million of other small things that get taken for granted in everyday life would be gone. Companies that are US based have a responsibility to work in their shareholders interest and I can't see any rational shareholders wanting to leave the entire US market for the shithole TX market.
Edit: I replied to the wrong comment but it kind of fits so I'll leave it.
There were more deportations from the Obama administration than both the Trump and Bush Admins. Clinton deported more people than any president before him back to Grover Cleveland. Obama had over a million more people deported in the 8 years he was in office than Bush had in his 8 Years. The bs right wing talking points are easily proven false and there is plenty of evidence to prove them false but once the idiots hear something they latch on to it and believe it no matter what. The only difference between right wing immigration policies and left wing immigration policies is the left wing tries to treat immigrants like human beings and is easier on those seeking asylum.
Funny I just reread your comment and saw you mentioned something about treating people like humans I agree and that's my point also.