Are "low-risk people" somehow living in an isolated society with only their kind? Or do they also have parents, grandparents, immunocompromised or overweight fr

Are "low-risk people" somehow living in an isolated society with only their kind? Or do they also have parents, grandparents, immunocompromised or overweight friends? The ones who you could argue are at the lowest risk level – those that will have an asymptomatic infection and might not take precautions because they feel fine – are actually presenting the highest risk to every vulnerable person they encounter.