If everyone agreed on everything, the world would be less fun ! My main problem with nuclear fission is that we generate a lot of waste that is almost impossible to dispose of and very dangerous. We don't even know, in case of a civilization breakdown, how people would manage the situation if knowledge was lost. [0]

edit : ray of hope here [1b]

Currently there has been many accidents with nuclear power, and we don't know how to manage those. Fukushima is still releasing lots of radioactivity in the sea. Yet radio activity about this is close to zero. [1]

And new ways to tap into fission power (pressurized reactors) are dangerous and hard to build.

Yet, I shall agree with you, that there is no definite solution to the energy problem, consuming less would be a good start.

[0] https://en.wikipedia.org/wiki/Into_Eternity_(film)

[1] http://www.asahi.com/ajw/articles/13228942

[1b] https://futurism.com/the-byte/nobel-prize-lasers-destroy-nuc...