It would be a hell of a lot worse place to live in. Trump would:
- Easily surrender US to Putin and/or Kim Jong-Un
- Not care about climate change (complained about clean wind energy or windmills decreasing bacon consumption, remember?)
- Discriminate non-white races and women
- Deport millions of immigrants (many of which are the backbone of many jobs and workforce)
- Increase prices on everything because of increased tariffs and letting greedy corporations to price gouge.
- Dismantle the Department of Education
- Put all his opponents in jail like a dictator
- Tax cuts for his rich allies
- Tax increase on the middle-class
- Remove the Affordable Care Act
- Possibly make it so that voting no longer has any power to elect anyone outside of his corrupt party.
- etc.
He is a threat to the US and would definitely affect the entire world as an extension of the US's global influence.
Of course, if he does become elected, he won't be "leading" for long with his deteriorating physical and mental state. He'll let his cronies handle it as outlined in Project 2025.