Cobbler
Thanks for posting some reason to these arguments.
Points so far that are worth considering.
Catastrophic failure causing collateral damage to the aircraft, including to other engines, increases with the number of engines.
Common cause problems (fuel starvation, ingestion hazards from birds, ice and volcanic ash are a wash)
PSM + ICR (Propulsion system malfunction coupled with inappropriate crew response) increases with more engines and is responsible for 60-70 % of the major engine caused incidents.
More engines may feel good when you have only shut down one, but when you get the second one you better do it right, including missed approaches.