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@Oliver Schick
I know you mean to ask why drivers cause casualties at roundabouts--I'm just picking it up because it's always worth thinking of the people involved in traffic rather than the infrastructure that causes this behaviour.
Basically, they are fast-moving multi-lane environments with a lot of visibility issues. They introduce detours and require much longer journeys for pedestrians and cyclists trying to avoid the roundabout, requiring them to cross at many points.
Without too much technical explanation, I like this page (from Galway Cycling Campaign) for the illustration of a lot of potential conflicts that could lead to crashes:
http://www.galwaycycling.org/roundabout/roundabout01.html