What if Disney wanted to integrate their own DRM support into the Linux Kernel so you could watch Disney Blu-Ray movies? Would you accept the "you don't have to watch Disney movies" justification?
I'd be fine with VLC having a way to watch proprietary Blu-Rays. I think it has that feature and it does seem useful for those who want to watch Disney Blu-Rays. VLC is supposed to be pretty much a swiss army knife of media players, after all.
If you wanted to compare to the kernel then best comparison would be to something like proprietary drivers or something.
We had to fight corporations for the right to decode DVDs and Blu-rays with FOSS software. This has been a major part of the software freedom movement. I don't want to see a deviation away from principles.
There's room for both the principled take and the practicality. We have both FOSS distros and those that ship patent encumbered stuff and proprietary driver.