On causation, as far as I can tell, the 2015 finding of epidemiological evidence for a 41% increase in non-hodgkins lymphoma (NHL) was rebutted by non-affiliated researchers, but paid experts are continuing to publish, and claim others have recently found a mechanism. But AFAIK there's no epidemiological or mechanistic proof, now or at the time they made warnings. (I would assume a failure to warn requires some proof they knew of the risk?)
In this case, 57 is barely on the young side of the affected population, but decades of exposure is hard to overlook.
Warnings are something of a fiction. Detailed legalese is regularly ignored, and if it's unclear any commercial gardener avoids glyphosate even today after all the scary news. But the hugely differential impact is a legitimate environmental justice concern, and the lawsuits might be the tip of the iceberg.
It would be best if Monsanto/Bayer negotiated a pool to pay affected people and more importantly to do outreach and monitoring for those who might be affected.
The incentives are all wrong here: huge 100X punitive damages based on failure to warn when there's no proven risk just make any rational decision-makers dig in if not suppress research. It'd be better for companies to pitch in for investigations and treatment over the lifecycle of the product, in exchange for protection from legal lotteries.