They still not have done a genocide (like British with USA native Americans, or Spain in south America many years before) also for France colonies was and some still are part of the State, so their Citizens get French nationality witch does not compensate their oppression, but let them potentially emigrate far more easily and becoming French Citizens like immigrants in USA can apply, UK have never done something similar. Also France have always colonized by the State, with troops etc, not with opium smuggling or commercial criminals (Indian's companies). That's why I put UK at the top of the most criminal in the list. They are ranked third there because Dutch and Belgian crimes was far bigger even if for a limited period of time and geographical areas, but still at the top IMO.

I rank Spain crimes a bit lower because South America colonization is far in the past, in an era where certain crimes was not considered much crimes from the point of view of most populations, otherwise they would be at the top position, perhaps counting also they religious crimes against also their own citizens.

Anyway any power have a blood trail, that's just a rank for the most "recent" ones...