How about this scenario:
Person A goes to WDW, doesn’t wear a mask, doesn’t follow guidelines, gets infected but symptoms are mild.
Person A returns home, goes grocery shopping, and coughs all over Person B.
Person B is a nursing home CNA, has been following all precautions, only going out for essential needs, she’s wearing a mask but still gets infected.
Person B however remains asymptomatic, and thus continues to work (she doesn’t have a fever) and even with a mask and good cleaning technique passes the disease to multiple residents who then die.
Is person A at fault?
This can and does happen, and is why some of us view your opinion as a bit selfish. We are all in this together and have a responsibility as part of this society to take some precautions.