"coordinated" disclosure is a wonderful thing in a vacuum, but when people are actively being exploited then what? You silently wait to announce until the vendor is ready? How many people get owned in that time frame? How many people could mitigate in the meantime if they're tipped off to what the bad guys already know and use?

There's no "right" answer because this is a holy war that's been going on for a very, very long time now.