Can we prevent this from happening again . No. There are always 1% of people that want to bend the rules. Tightening the rules will not change that , just affect the 99% of us that do follow the rules...
Actually this is not quite true. In several industries the rules regarding "compliance" have been progressively developed to promote transparency and consumer rights (financial conduct since circa 2000 and more recently data protection...two good examples). Increasingly the onus falls on the service provider to provide clear, transparent, fair, accurate and consistent advice to the consumer. And the provider, will be often be "end to end" checked in any regulated transaction - often by compliance agencies.
Why is aviation not being held to the same compliance standards?
For example standardised and compulsory risk assessment in all GA marketing. Obligatory availability of insurance documents, logbooks, maintenance records etc to any passenger irrespective of cost basis, together with easy to understand guides of what the consumer should be checking.
Bottom line...nobody should need to get on any sort of aircraft without an clear and transparent understanding of risk.
None of this is hard...other industries, just as complex, have been doing this for years.