Friday saw the largest global ransomware attack in internet history, and the world did not handle it well. We’re only beginning to calculate the damage inflicted by the WannaCry program — in both dollars and lives lost from hospital downtime — but at the same time, we’re also calculating blame.

There’s a long list of parties responsible, including the criminals, the NSA, and the victims themselves — but the most controversial has been Microsoft itself. The attack exploited a Windows networking protocol to spread within networks, and while Microsoft released a patch nearly two months ago, it’s become painfully clear that patch didn’t reach all users. Microsoft was following the best practices for security and still left hundreds of…

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