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But also one hard to justify in divisive times with diametrically opposed sides becoming highly popular, thus those extremes having an increasing chance to actually & drastically affect our lives.I think it's especially easy to justify in our times, and it's arguably the sane position to take. Polarization and extremism we see in politics today is dangerous to society and democracy itself. Disengaging from various small changes that are orthogonal to you and your community is advisable, because the cost of engaging is increasingly the deterioration of individual relations with people. It's blowing up your own country from the inside.
A lot of political disengagement, including my own, boils down to this: we don't want to fight someone else's war, and we'd preferably like they didn't fight that war, because all this fighting claims a lot of collateral damage.
> By the way, that doesn't mean everyone has to become experts in lots of topics. Delegating this is quite the responsibility as well.
Delegating in modern democracies is actually one of the reasons people disengage even when they do have a stake or opinion on the topic. It's very hard to make any impact on an individual issue (not "it takes some effort hard", but closer to "winning gold on national championship" hard).
Say, for example, that I want my country to invest in nuclear power, or institute carbon taxes (both are things I currently believe in, and to make it less difficult, I'll use "or" in this example, even though I want "and"). There's literally no party in my country I could in good conscience vote for, or work to support. Not a single one. With the one party that seems to share my views on those two topics I have enough disagreements on other things that I feel reluctant to vote for them. And even if I were to put aside our differences for the sake of pushing the two issues I care about, and even if they magically won the next election, I'm very sure (based on historical experience) that they'd successfully change one or two things for the worse (from my POV), while making exactly zero headway on the issues I voted on them for.
I think more people realize this than not, hence the bad election turnouts in most established democracies worldwide. People don't believe their voices will be heard, because there's enough distortion in the middle.