Move the limits up so it is a more clear-cut out of limits decision and any pushing of those limits becomes slightly safer
No matter where you set a limit there will be folk, for whatever reason, who will take it the extra yard. People bust the approach minima in an effort to get in, and they can be just plain caught out in their rolling of the dice. Some operators do raise the legal limits for various reasons, often based on the pilots experience level eg military green/white instrument ratings.
Going IFR is no panacea, local A320 airline crew had been planned to a VMC airport, on arrival it had been hit by unforecast fog, with no fuel to go elsewhere they carried out an autoland, a procedure for which they had no training and the aid didn't have the requisite approval. Back when our country had a government run aviation operational control a Puma crew on a VFR ferry flight were advised their destination airport had been closed due unforecast thunderstorms and were asked to nominate an alternate. No alternate available and the crew insisted they would proceed to planned destination, which upset operational control no end for their order was sacrosanct, you have to proceed to an alternate. The only alternate available would have been to find a clear spot and land in the scrub, they made it to destination without confronting any weather issues. Weather forecast are horoscopes with numbers it is said.
one of the most difficult things to teach pilots was when to say no
Nicely summed up
Crab, but as you try to fill that bag of experience when to say no is itself a variable, and you hopefully don't have to dip into the bag of luck in the process.
Our EMS industry has an enviable record, often lay in bed at night and hear the local 412 going over in absolutely foul weather and think better you than me, has to be said the crews were very experience IMC folk. The dreadful US EMS experience is commentary I think on the competitive nature of the industry and the lack of standards, witness the recent report where the crews were subject to disciplinary action for refusing trips.