Back then the level of safety provided on an instrument approach would have been no where near that of today. A certain percentage of loss of aircraft was expected on every mission, provided it stayed below this level it was acceptable.
A system which enabled an aircraft to have a better chance of landing back at base instead of crashing in a field would have been welcome even if not 100% safe.
The benefits we enjoy today of being able to confidently fly an ILS approach are thanks to the war time pioneers.