It does. Knowing what caused this should be important, so it doesn't happen again.

If it happens naturally and randomly, there's nothing we can do. If it was a lab leak, maybe some special precautions should be taken, or such things should not be done in labs with iffy security practices... or maybe even not done at all.

Many workplace (and general) safety rules were written because someone has died doing something (now considered) against the rules. Killing a few millions of people and stoping the planets economy for almost two years seems like a terrible cost of some research gone bad.