Trust me, I don't give a damn about open source as an end in itself—to me RMS means root mean square first, Roads and Maritime Services second, and occasionally I might be reminded of an unwashed beard.
> "Trust me, I don't give a damn about open source as a means to an end"
See, I think that's where you differ from most people. To most people, I believe open source is a means to an end, not an end unto itself. What they want first and foremost is something that works, and it happens to be the case that having the source code freely available facilitates having something that works and gives them a sense of comfort, an assurance, that it will continue to work in the foreseeable future. So appealing to "it's opensource, so you should like it" totally misses the mark. The argument should be "it works, therefore you should like it."
Had SystemD never given anybody any trouble, I don't think it would be hated. I think SystemD is hated because (particularly during early adoption years) there were a lot of things about it that didn't work for a lot of people. This made them angry, because it violated what they actually cared about. Not permissive licensing, but rather having something that works. The principle of open source is not axiomatic to most people; it only has value when it is part of having something that works.
Somewhere else I see this mentality: Android. There are a few among the 'community' who would have me pop open the champagne because "Linux won" on account of Android being an incredible commercial success. But why should I celebrate that? Why is "number of CPUs running Linux" the metric I should be glued to? Because Linux is open source? So what? Honestly, who gives a damn?