Can't other states help? Have they offered to help?
Obviously Texas is helping --not only in Houston. Dallas' Reunion arena is housing more refugees, and a Fort Worth Hospital is taking some of the evacuated patients from hospitals in NO. Texas' Governor Perry has opened up Texas schools for refugee children--and from what I hear there's a lot of them already signing up.
IMO Once they start comparing Texan school to the school in LA, they may not want to go home.
Other states in the area either got screwed themselves or simply do not have the ability (or tax base) to deal with so many people. Texas has the space, the money, and the ability to deal with a major city evacuation or two. We have *lots* of open space that can be used, and our armed populace is useful for keeping people in line.