Yes, I will say it is up to everyone to protect themselves. No one is required to protect others, not even the police are required to protect others.Are you saying that it's up to everyone to protect themselves and that no one has a personal responsibility to not engage in behaviors that would tend to infect someone?
And then you changed it up away from protection and got into behaviors that put others at risk. There is a difference there.
So your first sentence starts with the right idea that everyone needs to protect themselves and ends with a different concept of endangerment. The rest expands on endangerment, so kind of moving the goal posts.
I can easily protect myself while not endangering others.
I suppose I could also protect myself while endangering others as well but really that could only happen after I failed to protect myself. Otherwise I would not be a threat at all.
(I hope it is obvious enough that I am talking about COVID here and not ebola or drunk driving or running with scissors or anything else.)