"I see a lot of problems ahead.
I sincerely hope I'm wrong."
I hope you are wrong too - but I don't think you are.
There will be frustration in these communities that are taking in evacuees in a month or two - and it will be understandable. The vermin will come out.
Where they can be shot? Texas LEOs and civilians, with CHLs and/or "deer rifles" (or in my case an ugly black semi-auto version of a battle rifle in 7.62x51, with scope) in the back of their pick 'em trucks will not put up with any of that... er.. stuff. Of course my neighborhood is pretty safe, surrounded as I am by two divisions of the US Army. :)