You define a politician as one who does politics for the same reason you define an artist as one who does art.

Everything you mentioned above is political but that doesn't make it politics.

It's defined as "the activities associated with the governance of a country or other area, especially the debate or conflict among individuals or parties having or hoping to achieve power."

Politics is what politicians, aspiring or otherwise, do. Just like art is what artists do. And music is what musicians make.

You're using words wrong and then bitching at people for not using words wrong with you.