Yeah it's a very common misconception that what we need is a "clean" and unlimited source of energy (I mean, apart from the sun, which is one and has served Earth very well until now, but there will always be limits in how we can leverage it.)
If we ever get to that point and really master nuclear fusion, it will likely NOT be good news for the future of humankind. If it's really virtually unlimited (and thus, eventually very cheap), we're just gonna end up blowing ourselves up one way or another. It's not even sci-fi or pessimism, it's mainly just basic thermodynamics.
It is sad to see that most people, including the world "leaders", do not understand anything about energy, yet keep talking about it.