Did not say OK... said not all are life threatening.
Anyway, this is a very complex issue. I feel it is very important to know how a compound effects the product, especially when it has been placed there by human intervention. There are so many influences we cannot calculate the outcome, long term effect or influence - it is in the theory of chaos. "Retain" on apples (another growth regulator also like Algar) inhibits ethylene production. This is a hormonal influence which has been introduced rapidly to a plant vs evolution.
Organics prefers to use no spray - it is best to encourage insects to inhabit the orchard environment. But commerical demand for organics has placed in a sense unbalance in the orchard environment which is why organics today no longer always means local or low level spray. In fact organic apple orchardist sit on their tractors alot more than the conventional orchardist. Why, because again, the lack of research means that organics has not been able to move with the times and are 2nd on the list with new spray releases. The conventional industry gets the new sprays first.
Most real organic products is not really commerically viable because most organic products have the pressure to perform on a global platform alongside conventional products. Organics is not about the end product, but about retaining land in a long term, sustainable manner.
I really find this a difficult subject to explain as it is so complex Different fruit, vegetable and animal organic production varies so much in success and labour input e.g. kiwifruit is very easy and cost effective to manage organically, while apples are extremely difficult.