It's easy to not care, anything bad can happen and you can blissfully wash your hands of it. You don't care, so it doesn't matter.
I remember being a teenager, my defense against anything bad that happened to me was, "I don't care" with a snide attitude. I was lying, I did care, but I built up a mindset that not caring about anything made me stronger.
As an adult, I know this is wrong. Caring requires strength. Caring is hard. That's why we need to do it.
I recently had a conversation with a friend who is now no longer my friend. He said, "so, what you're saying is, you go out of your way to try and deeply understand as much of everything as you can?"
I answered, "Yes. Being curious about others, issues outside of myself, and the world around me, is in my opinion, a moral good."
His only response was, "that's not for me, that sounds exhausting."
We started the conversation because he was openly making fun of other people who were not like him. He thought it was okay to laugh at other people for being different. To mock others if their differences were amusing to him.
His lack of curiosity, his lack of caring for others made him a repulsive person. Be careful what you choose to "not care" about.
It's one thing when "public affairs" and affairs of your local community are one and the same. But modern democracies seem to be actively preventing citizens from being actually informed about anything, and the granularity of elections ensures people's opinions (ill-informed or otherwise) are uncorrelated with end results.