Adding in, vaquitas have a very small native range. Like, it's tiny. Seriously, look it up, it's itty bitty. That makes the species all the more vulnerable.
Governments and conservation organizations took waaaaaaay too long to take any action. Everyone who had significant ability to help waited until the situation got severely critical before they decided to do something. I don't recall seeing any serious discussion until the population went below 100.
I really wish they attempted the capture and captivity 10 years ago. Then there would have been some room for error. But they didn't try until there were like, 30 left, and it's like, okay, if one of them dies from this that's a significant portion of the population. I only reluctantly supported it because it seems like the vaquita is in a go big or go home situation.