There's a ridiculous (and ridiculously common) notion that each and every one of us should be knowledgeable about every subject. The thinking goes: "If our government deals with it, then voters should make themselves aware."
I'm sure that was a fine sentiment when government was limited and local. It made even more sense before military, economic and ideological influences did not regularly span the entire globe.
But it is foolish to expect anyone to have a deep, informed opinion on every subject. That is doubly true in modern America. Internet alone has already complicated society to an absurd degree, and it's barely a generation old!
Where does this expectation come from? Media? Politicians? Universities?
It's good to be curious. A little knowledge can be dangerous, but knowledge is generally useful. One often doesn't realize how knowledge of one subject will become applicable to other subjects later in life. And, as I often tell people, "God has offered you the entire world. Why accept just a part of it?"
But there is no responsibility to care about absolutely everything. And no person can escape the necessity of trust.
Keep that in mind when considering if someone's disinterest in a particular subject is anti-intellectual.