Police twins Vs singles..
The NSW Police have been operating singles since 1979, and have only lost one , coming from an N2 bleed air problem running the engine down to idle. They plopped into the sea and all OK. They have also operated several twins - a new BK117 A4, which was operating for only 6 months when an engine cowl went through the rotor resulting in a semi-controlled ditching. Machine written off, but crew OK.
Next twin was a used twin Squirrel. Lasted a bit longer, but also had a swim when the same pilot as in the BK was swamped by a wave while rescuing a fisherman off rocks.
So, 2 spectacular accidents for twins, which made zero difference by having 2 engines, just made the crashes more expensive. The single accident would not have happened if it was a twin, but our skinflint government wouldn't come up with the money for more twins, even if they could be justified.