This isn't an issue of "fashion" or "opinion". It's an issue of whether the guy is right or wrong, and if he's wrong[1] whether or not he's caused damage to his employer[2], and if that is true whether it is a firing offense[3].
You don't get to avoid discussion[4] about those subtitled points by retreating to some kind of invented safe space here. Out with it. Is he right?
[1] He is.
[2] He has.
[3] It is.
[4] Yeah, I'm just asserting without evidence too. But only to avoid the pointless flames that result.