If you lived in a bubble, you could filter out all the stuff around you. You could control what you exposed yourself to, and you could stay safe and secure. If you fell down, you would just bounce back up. If someone tried to touch you, they couldn’t get through your bubble. It would feel warm and cozy, and everything would be alright. Right? Wrong.
The problem with living in a sanitized bubble is that the body needs a certain amount of exposure to germs and toxins to build up a resistance to them. Limited exposure to things that can harm us makes us healthier while avoidance of harmful things may actually make us unhealthy. This is the basic principle behind modern vaccines.