Or it wouldn't have mattered - it can be a lot of different reasons (including randomness) that caused the situation in Sweden and I've yet heard anyone do any

Or it wouldn't have mattered - it can be a lot of different reasons (including randomness) that caused the situation in Sweden and I've yet heard anyone do any kind of proper scientific research and argument about it, so most likely we just don't know. "Lies, damn lies, statistics"...