It is strange to see people with such mistrust of a microwave because it is "unnatural" and therefore unhealthy.

The process of cooking anything using something "natural" like a fire creates a lot more carcinogens than a microwave.

You wouldn't put plastic in a pan or oven to cook your food in, so if you want to reduce your exposure to plastic just use another container, it would be useful to know what the objective harm of this practice is compared to say using gas stove.