Fusion is not inherently safe. It has significantly higher rate of neutron discharge for the enegy produced which can damage the reactor vessel and potential to cause nonfuel material to become radioactive.
Ontop of any power disruption of the system has the potential for radioactive plasma to escape with nothing even remotely equivalent of a SCRAM to bring it back under control.
The only reason fusion appears safe right now is because its all still developmental phase and any issues are being handwaved as prototyping issues and not treated like the actual potential catastrophes they are.