it’s always about weighing the pros vs the cons. And grounding has many more benefits that outweigh any potential risks that you’ve mentioned. Same logic would apply to forest bathing or even eating salads with the risk of  ingesting parasites. Should we not eat or do those health promoting habits in fear of what may or may not happen?

They are ubiquitous, and so the best defense is to support your body’s immune system through diet and lifestyle measures, and take precautionary measures when needed, instead of fearing pathogens. And this is why I also recommend minimum once yearly parasite cleanses. Veterinary clinics deworm horses and other animals every 6 months, I believe the same should apply to humans.