Impurity problems have occasionally come up over the years, but they have largely been addressed quickly by existing regulations. And at no point have they ever approached the level of risk posed by the illnesses they are prescribed to treat.
While the risk of impurities in the generic drug supply certainly warrant research, the percentage of issues again doesn't approach significance with comparison to these pervasive illnesses.
Nothing is risk-free. Eating food has risk, taking paracetamol has risk, getting blood drawn has risk.
Saying something has risk without talking about the amount of risk and the context of the risks it mitigates is pointless.
Drug impurities in generics introduce negligible amounts of risk. Eating peanuts in public or going for a drive is much riskier, and we almost all do those things without a second thought. By contrast, access to affordable drugs mitigate huge risks: the illnesses we medicate can, did and do cause horrific harm up to and including death, and do so very well.
The pharmaceutical industry is not immune to criticism, it is just they have weathered all the reasonable criticism leveled at them. If you are willing to drive in a car, taking generics that could should be a complete non-issue for you.
In an era of fake news and increasing doubt in the medical establishment, publishing reports like this is not only irresponsible, but unethical. This only adds fuel to the fire of unwarranted skepticism towards our medical system.