Free is an ideal, and pragmatism takes precedence over idealism any time. The Linux kernel is probably the best example of how free and proprietary can come together to create a decent experience, since it plays nice with both free and non-free kmods / drivers / software.
If RMS had his way Linux would have been just another Hurd today.
That said, is there a source for your claim that Linus and the kernel devs are very hostile to RMS's mindless 'Freedom' preaches? A link, perhaps?I would love to read the discussion that took place.