I've never understood the "morality' arguments in rooting or not rooting for certain types of weather. I think looking at it through a lens of only that storm can be too myopic.
I can very easily root for a blizzard but hope people are not hurt or injured during it. I even proactively try and warn as many people as possible if it looks like dangerous weather is coming. In the end, yes, extreme weather does injure/kill people....but at the same time, we learn from extreme weather events both in terms of forecasting ability and preparation which actually saves lives in the future. So on that front, extreme weather events can be "good"....we're learning and saving lives in the future when the next blizzard or ice storm or hurricane hits. If we didn't learn from previous weather disasters, it's hard to estimate how many more people would have died in events like Katrina in 2005 or the blizzard in February 2013, or even the Buffalo blizzard this year....all those events injured and killed people to varying levels of magnitude, but they would have been way worse without the experience and learning from previous events.