Apparent keylogger gained access

The iMac also has LogMeIn installed. Never, ever have remote access software installed without having a very good reason for its existence.

What makes you think you have a key logger? The only way that could have been installed is if someone had physical access to your Mac. I don't see any sign of a key logger. Where are you key loggers and why do you have them?

They could have gotten the password from an insecure site. Change your password.

Uninstall McAfee and Cisco Video Guard. No Anti-Virus software or so-called “cleaning” apps are needed or recommended for Mac OS. They can conflict with Mac's own built-in security. At best they will slow your Mac by using unnecessary resources and at worst will bork your entire system. Your Mac has all the built-in protection you need.

https://www.apple.com/macos/security/

The only malware I see installed is McAfee.

What makes you think you installed a key logger or spyware?

What do you see in those reports?

You have Go To Meeting and Citrix installed, which, if your password is compromised might potentially be a problem.

Do you use the same username and password on multiple, independent online services?

Did this email happen to say you were caught doing naughty things and demanding a large Bitcoin ransom to keep them from releasing the video? If so, it's nothing but a scam. They have nothing.

What makes these scams seem more real is they're using the billions of user information stolen from the many data breaches you've read about. That usually gives them an email address and a password associated with it, but not the web site it's for (or they'd go into that account immediately).

If the password happens to be correct for a site you're still using, change that one right away as a precaution.

Given the lack of any severe malware on your Macs, I would think all you need to do is what you already have been changing a few passwords.

Otherwise, an email is just an email and almost never proof of anything. They're about as believable as the sheriff calling to say you missed jury duty, and unless you make a very non-professional type of payment over the phone RIGHT NOW, you'll be arrested.