Re: Ignore them.
"Basic knowledge of how law enforcement actually works" is probably in just as short supply as knowledge of how to read an email header, so that doesn't really seem to get us much further.
I received an email "from" my bank the other day, saying that someone had tried to log on to my account and I should log on and check for any suspicious activity, just click here. Except I knew it wasn't from my bank, because - for precisely this reason - I've never given them my email address. Of course I also know that even if I had, they wouldn't have sent me an email like that, and even if they did, I wouldn't click any link I found in it, and even if I was tempted to do so, I should use a quarantined browser and check the domain of the linked site before typing anything into it. So I had many layers of defence against that phish. But not everyone would. The more tools you can give people, the more likely it is that they'll find one they can actually use.