Your friend who recommended “not to go out and get it, but it isn’t that bad” doesn’t know if they gave it to a vulnerable person.
It’s never been just about you or how you and your circle will handle it.
Yes, I'm sure the 20 days they were collectively quarantined was completely reckless and putting people in danger.
Edit:
Also, his wife caught it at work. Where she was being, you know, essential.
You will likely never see the consequences of that, but you could have transmitted the virus to someone who died.
It’s not a lot to ask for people to refrain from social gatherings and unnecessary activities in order to protect their fellow humans. Do no harm and all that you know...