For singers who are mostly political, sure, this kind of makes sense (think most of the famous 60s singers, most punk etc) but, to the best of my knowledge/limited listening, Swift's music has seemed pretty non political, which makes it a bit weird to me. (That being said, also what makes it a bit more effective. Rage against the Machine telling folks to vote is preaching to the choir.)
To me, there's a difference between music that's explicitly political effecting political behaviour and music that isn't.
If, I dunno, BTS got hundreds of thousands of kids to register as Republican, I imagine/hope people would be concerned that that's where kids are getting their political direction from.
Edit: I have no idea if BTS is actually political, I assume not. Most of the young music this old fuck listens to are political because that's what I enjoy, so I'm not great at picking pop non political stuff. Sorry!