A lot of snarky replies to this comment, but the reality is that if you were selling an anti-virus, identified a malicious virus, and then chose not to update millions of your machines with that virus’s signature, you’d also be in the wrong.
No, for exactly the reason we just saw, and the same reason why vaccines are tested before widespread rollout.
As an example, reaction time is paramount to counter many kinds of attacks - thats why blocklists are so popular, and AS blackholing is a viable option.