Look at your own map you posted. Then think about how much influence the non voters could have had. Given the fact that it’s apparently more than half the population it would have made a huge difference. Possibly with a very different election outcome. just because it feels like it doesn’t matter doesn’t make it true. Every vote changes the result after all. Even in a system that has flaws.
While it’s not great to pick a side that you don’t quite believe in it’s still better than not voting because that only helps the side that you really don’t want to see win. Which is exactly what happened. That is in my humble opinion the real shortsighted and naive thing Going on here.
I mean… Just look at the news. We don’t have to imagine it because that is what is going on.