I'm gonna presume they are very bluntly critizicing the lack of preparation for events like these, something that should absolutely be done. There's also this other vignette where they seem to try and explain themselves:
"Italians, it wasn't Charlie Hebdo that built your houses, it was the mafia!"
Every time these people anger someone it's because people take these at face value believing these people are racist, morbid, heartless assholes who'll make fun of whichever tragedy just took place, but it's usually the case that they are actually attacking either the responsible parties or those that contributed to the root cause. And I feel that's absolutely neccesary whichever way you wanna do it.
The scenario where I'm just wrong and they really are just having fun with those that perished in the earthquake is unfathomable to me, but feel free to correct me.