I was paying attention pretty closely to things when the 405 was introduced here and there was no high profile safety campaign that I ever noticed (why would there be - only 1 in 100 people even knew a Peugeot is a car, much less what a 405 is), other than Peugeot had to recall all early cars because of the fuel hose at the back rupturing in collisions. We all noticed they had no airbags of course and this was most in-your-face in the USA where nearly all 405 got electric seatbelts as their passive restraint. Plus a redesigned dash compared to the European version, which was officially a knee bolster for unbelted drivers and passengers, or those who were only wearing the shoulder belt (possible, and common in US cars with electric belts).
The transition from rear wheel drive to front was a shock to the traditionalists here and most 505 lovers don't like the 405 and possibly vice-versa (I never wanted a 505 myself, for example). The 505 was the most successful Peugeot model in the USA by far, but not in Canada, where the 504 was easily the best seller.
The 605 was certified for sale here and even appeared in some 1992 model year brochures concerning the range. The 605, had it not been an electronic nightmare in the first years, may have tempted 505 owners (but: no wagon!) and Peugeot wisely decided the 405 was a marketing dud and the 605 would be a warranty nightmare so they bailed out.
For me it was regrettable that they left and I was very upset about it at the time. However, given what they had to sell back then, it was the correct decision. I would have bought a 406 had they been sold here. They should be back in a few years' time.