The problem is, not all of Houston needed to evac. Moving the guaranteed danger zones would've massively helped thin out rescue efforts so they don't have to condemn people (or at the very least, as many people) like they are now. People didn't even need to evac the city, setting up pre-emptive shelters farther north and in areas much less prone to flooding would've done wonders as well. Honestly there's a lot they could've done. The answer was NOT to do nothing. But obviously the answer was not to evac the entire city either, that's ridiculous. Something should've been done. Not the mayor getting told "shit's gonna get bad dude." and him saying "Ehh hunker down people it'll b k"