Sci noob here. Someone explain like Im 5 why social isolation is best for covid19.

Again, I'm a noob, so this is just a really creative theory BUT what if the virus gets worse? I mean what if (in theory) there is something wrong with the system fundamentally. I mean the whole 'use Clorox and wash your hands' parts even. I know what you are thinking. What kind of idiot doesn't want to wash their hands during a global pandemic? My point is what if our excessive use of these types of products encourages their growth or mutation. When really we should of been trying to integrate with these things and be filthier to build up an immunity?