That and the simple fact that without it the hardware you've invested in won't work. So this is very much an individual choice, if you don't have such hardware you are fine but shouldn't be voting on whether or not someone who
does have hardware that won't work without proprietary blobs has to go out to buy new gear. There are all kinds of considerations that go in to this decision (for instance: environmental impact) and I'm all for compromise when it helps out others.
At the same time, you have a good point, these decisions are difficult and need to be very carefully weighted. Debian and RedHat are the two distributions that everybody else always ends up following so a major departure from established policy there has potentially huge impact downstream.