Right, because the only choices were to evacuate EVERYONE or NO ONE. Not everyone was at risk of flooding, vulnerable people in low-lying areas should have been evacuated, but the democrat mayor of houston left them there to suffer...and without a doubt will end up blaming Trump for this.
I can’t see how total evacuation would have been feasible and then you would have millions forced into long stays away from flooded homes that they might be better off repairing and restoring to whatever extent is possible in a few days’ time.
Some specific areas maybe could have been evacuated, some maybe were from what I’m reading here. But politics aside, a full evacuation seems like the worse of the two options.