But if you are in contact with someone under 31 who has no choice but to be in contact with someone over 31... I guess the question you have to consider is how much to blame is each individual who chooses to ignore recommended procedures yet passes the virus on to someone who ends up dying.

Then why are they out? They have no excuse. My parents are older and so I'm not going to visit them, and instead call regularly. That's unfortunate but that's the safest thing to do.

By staying out you are contributing to the spread of a virus that society at large is ill-prepared for. You have no excuse either. This shouldn't be hard for a grown adult to understand.

If your behaviour is only responsible on the assumption that everyone else you meet is behaving responsibly, then your behaviour is irresponsible.

Scenario: Your parents get it from somebody who is acting irresponsibility, who in turn got it (in)directly from you.

Does it really matter that it's "somebody else's fault"?