Nobody has come up with a way of making controlled fusion.
it makes life easier than using a regular saw where you might have to work a long time to cut a piece of wood or something
No. Yes. That pretty well covers it.
well we should use wind power because it doesnt create any air pollutants and is free of harmful green house gases.
There is no use made except in nuclear weapons. Attempts to make fusion happen on earth in a controlled way for power production have not succeeded yet.