The apology is coming fairly quickly after the event, and there’s little doubt that Zuckerberg meant well. With that said, it’s not apparent that he fully understood what incensed people in the first place.
For some, the issue is that the VR tour exists at all. Hurricane Maria was an unprecedented disaster that crippled Puerto Rico’s infrastructure (most of the territory still doesn’t have power or clean water) and produced real casualties. To use a tragedy for what looks like a tech demo for social VR, even if it’s well-intentioned, seems insensitive. That’s not to say that VR or other tech novelties can never be used to highlight serious issues, but it’s evident from Facebook’s experience that companies have to be respectful as possible of people’s suffering — even if that means refraining from using technology to begin with.