I think the whole twin thing has a lot to do with empire protection when you have bigger companies investing time and money and lots of paperwork so they can use twins and be more versatile , the last thing they want is someone in a much cheaper single moving in and stealing their work.
The fact is singles do fly in the uk at night and in and out of tiny confined areas a lot of the time with ppl's doing the flying so to say they are more dangerous is daft there is no evedence !
I fly both but have a lot more time in singles and have only ever had two occasion where I needed to put the machine down in a hurry both R22's , but when you have an engine problem or failure in a single the action is simple just land !
I find the complexity of a twin to be my biggest concern when flying them and the chance of taking the wrong action much greater , that may change with more time in them but I can't help but think under extreme pressure the wrong action would be easier . How many times has the wrong engine been shut down in a twin ?
CBS