If senior folks are unable to distinguish between genuine and fraud calls, then they are likely to have bigger issues.
It also makes the assumption that old people are stupid, which I'm loathe to make. Some of these scams have been around for years, and they weren't all old people back then.
I mean, obviously the people trying this are scum, but there's more than enough knowledge out there now to prevent these things happening. I'm not even convinced that it's old people in particular who are suffering, I think it's more the average Joe who is just a bit stupid. If you're stupid, then there's not a lot any one can do to help you.