Mostly public perception (annoyingly): people are still going to have a go at being anti-nuclear about it, but building a fusion power reactor is going to have a lot more public cultural cachet to draw upon then fission. We've got a generation of science fiction who's core message is "fusion power solved all the problems".

Though there are genuine advantages: for as radioactive as the interior of a fusion reactor may get, if you cut power it'll just sit there safely doing nothing. No decay heat, no potential isotopes to leak - maybe a puff of tritium gas - but that's it. It is a technology that has a perfect control loop for safety because it can't self-sustain at all.