News reporter: Oh it's just Mexico plus they're hit by so many storms every summer anyway. OH MY <swear swear> 2 PEOPLE GOT SHOT IN USA, like, CATASTROPHIC! Hurry crew! We must get there immediately!
Mexico did get hit, but nowhere as extensive in damage because they are prepared through experience, and Mexico doesn't have a huge pot of water.
Even more importantly, Mexico got no oil so screw Mexico for the world. Fellow Europeans, let's donate to the USA so they can set up their oil factories asap.
(I'm sorry people, but that's politics)
Katrina is stronger when it hit Florida, but Florida isn't below sea level so it is fine. The water keeps accumulating in those regions below sea level, so the damage dramatically increases.