The answer is simple. They are immature fools.
They obviously care nothing for the safety and lives of others and also themselves, especially their family, friends and other loved ones
They appear happy to catch it themselves and pass it on to others who could end up seriously ill, with Long Covid or even death.
This virus has already killed millions and will continue to do so unless or until the Governments of the world start enforcing mask wearing for everyone.
Even those who have difficulty breathing can wear protective masks which will allow them to breath normally. They need the plastic masks that are worn which cover their entire face including their eyes, nose and mouth.
My wife has COPD and she will not go out without this type of mask on and it does not prevent or hinder her breathing one bit.
There are 1000s of people throughout the world who refused to wear masks or get vaccinated and have ended up getting the virus and it cost many of them their lives.
We know wearing protective masks and getting the vaccine does not prevent infection but it cuts down the risk and those who have had the ‘jabs’ are much, much less likely to have serious effects if they catch Covid.