This is a perfect example of how you can never make people happy. A large fraction of the people on a hardcore realm die, others also quit because of it, it already shows in the economy and how you’re able to find dungeon groups.
And someone argues reviving them hurts the server more than it does good.
Also, keep in mind not everyone is or can be aware of DDoS attacks happening. Not every raid guild can keep track of what’s currently happening and fell victim to first DDoS attack. A lot of people also just logged in to play that day and then died. Dying to DDoS is NOT in the spirit of hardcore realms and this is a huge W to Blizzard.