Because for the first time in our lifetime, the US and global economy was practically shut down, much like a person purposefully put in an induced coma. They’ll bring the economy out of that coma, hopefully soon.
The carnage is that some low cash/high debt oil companies will likely go under. And the banks that funded them run huge risks/losses. Additionally, the housing markets around the oil-rig areas could take a hit as well and foreclosures rise.