Why is yahoo answers just a page to hate on or rant about trump and American politics?

Because very few of the public are able to ask relevant questions - but they can all rant. Nothing more complex is involved here. This mirrors the bell-shaped curve of IQ.

It’s mostly a site to attack republicans by democrats using false claims and lies.

cause sorne people have rnade it that way

Because conservatives hate when liberals expose their lies and deceptions!

Trolls and Bots kind of got rid of really good users , most of them there's still a few around

I think you mean Yahoo! Answers Politics board (and various other ones), since Trump is absent from discussion on many of the other boards. And it's become that way because the user-base is mostly American (or American-centric) and politics in general is a sh*tshow. It wasn't any less biased when Obama was in office, just less obviously so. Because of the obsession people have with Trump and/or the DNC, and how politically charged our society is right now, Y!A becomes a place where such questions are posted because we all need an outlet to express our feelings of triumph or disdain. This board is just reflective of general society.

Probably because Trump is a clown and American politics is a joke.

Mousefarts 🐁 💨

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Trump does dominate, but America's politics gets drowned out by private money media.

Looks like that but I bet most of them that rant are just TROLLS who what to get some kind of reaction from people.