There were problems in earlier days due to lack of proper regulations, but there have been far more stringent safeguards for the last 30 years or so, including compensation schemes when firms go bankrupt or in cases of fraud. So, what happened decades ago isn't really an excuse for people not making their own provisions over the past 20-30 years.
Yes, incidences like Robert Maxwell put some people off contributing to pension schemes, but it's a numbers game. The vast majority of savers have done incredibly well over the past 20-40 years of saving into pensions. It's only a very small minority who lost "all" of their pension monies, and even then, most still had a decade or two or three to mitigate the losses by continuing to invest.
Sorry, but to say "look at Maxwell" and others as an excuse not to make your own pension provisions is just that - an excuse. Fair enough, people planning to retire 20 years ago may well have been badly impacted by schemes like that going bust, but that's history and people retiring today have had 20-30 years of potential savings under much better regulation and protection. If they really didn't want to risk pension fund collapse, they'd still be relatively healthily provided for if they'd paid into savings accounts instead, especially tax free ISAs which is a common alternative to formal pension scheme investments.
If I have one hope of the recent WASPI pensions changes and other pension scheme collapses of decades ago, it's that people make more attempt to look after themselves pensionwise throughout their working life. Hopefully, the relatively modern compulsory workplace pensions will get more people investing for their own future and taking more responsibility for themselves. Even better with free investment advice from the Govt funding "Pensionwise" that removes the excuse of people not wanting to pay for professional advice (which in many cases isn't needed anyway these days with the pre-packed diverse pension funds!)