Many people have moved away from Steem, and a lot of witnesses that people were voting for prior to the 0.22.8888 "hostile soft fork" have shamelessly switched over to 0.22.8888 in hopes of getting a vote from daddy Sun.
I don't think an apology is needed from most people on that list who were simply unaware - not unless they're a whale that's been majorly contributing to 0.22.8888 witness ranking.
Affected users should simply check which 0.22.8888 witnesses they're voting for ( log into SteemPeak - https://steempeak.com/me/witnesses - CTRL-F 8888 ), remove the votes, and reply to this post letting people know that the votes have been removed.
That is true of most users. Asides from whales, I would add some more people case by case who probably owe the community an apology. They got their airdrop, so they don't care.