Or because they know that as soon as a bug is found, people get to work on fixing it, and it gets sent up and down stream as soon as someone's fixed it?
I mean, that's why I prefer Linux.
That it's free is a bonus.
That is as idealized as "Navy, the Global Force for Good". Yes, they do something but probably don't really know what are they really doing. That needs brain, not zillions of fixes to JS libraries.
Closed source = small number of brains working on problems.
Open source = large (potentially as large as the user base) number of brains working on problems.
I know which I'd rather have.