This is not a question about when to use reflexive pronouns. I am perfectly clear on that, and I understand that there are questions on the site already about when and when not to use them.
This is a question about what seems to be very sudden general confusion about reflexive pronouns.
This is something I see and hear (but especially hear) more and more in North America (I won't pretend I know what goes on linguistically in the street or on the tube (either meaning) in other parts of the world): the use of reflexive pronouns in place of subject or object pronouns, particularly for first and second person.
If you have any questions or concerns, please call myself.
You can give it to either Dave or myself.
Okay, I'll give it to either Dave or yourself.
Hearing this drives my inner snoot batty.
So, why? Why have North Americans (and others, if this phenomenon is global) started doing this? I'd love to read any reasonable explanation that doesn't discuss why these examples are incorrect but somehow addresses the question of why this has suddenly become more common...