Eh. It's more difficult to succeed in politics than in music. Far more people are also daily interested in music than in politics. If you ask average youngsters, they could talk endlessly about music, but hardly anything about politics. They might be hard-pressed to name any but a few politicians. Older people could talk about politics a lot, but they would spit on most politicians. I'd find it hard to believe it would be all that different in Japan. Normally you'd hardly dislike any particular musicians, even if you didn't happen to like their music.
That old man just has his head stuck deep in his ass. No wonder the daughter is unhappy, soon to the worst degree. The old fool can't even see that if he could just fix her daughter's poor school performance somewhat, then having her be a part of a band might actually land him extra votes, if he used the daughter's music talent wisely but not too blatantly in his campaign. But maybe all of his voters are just conservative geezers and that's all he needs.