Autumnrose If everyone was keeping their distance, wearing a mask whenever they are outside their own home, washing their hands, and avoiding crowds and parties, hugs and kisses, then the people you speak of who have the virus without any symptoms couldn't pass it on to anyone else. We all have to assume two things if we want to minimise the spread:-
1) That anyone we are in contact with could have it without symptoms, and give it to us.
2) That we may have it without symptoms, and give it to anyone we are in contact with.
If instead we assume either that because we feel fine, we don't have it, or that because we have some kind of magic force field around us, we won't catch it, then we are helping to maximise the spread.
Those who are not a part of the solution are a part of the problem.