I don't think it's morally justifiable to waste the immense amount of resources necessary to make all shelters no-kill when people are suffering, largely due to situations outside of their control.

I was talking about budget shortfalls and not hurricanes, but given the prevalence of the "blame New Orleans" mentality that gets tossed around regarding Katrina, I think it's really important to point out that those who were affected disproportionately represent the class of people who lack the ability to just get up and move somewhere. But they're largely poor and black, so it's a lot easier to laugh at them for being stupid than it is to acknowledge serious systemic issues.