Evans tactic is if in doubt blame the officials. I have posted before that I think that is a waste of energy. Better to try to improve what you are in control of
Most managers are like
that.
Leaving Evans aside for a moment, if you're a Manager who has to come out after a game to explain a defeat or dropped points, what are your options?
You can't blame the Owner for eg not giving you enough money for players, for even if it's true, that can only end one way.
You can't blame the Players even if it was their fault, since that will only get their backs up and they'll get you the sack.
And there's no point in blaming the fans, for not understanding what you're trying to do, or being impatient etc, since once they turn on you, there's no way back there, either.
By the same token, you daren't blame the Media, even if they know sod-all, or are only looking for cheap headlines etc, since they will be sure to keep the knives sharp for the next stumble.
And you can't blame yourself for eg getting your selection or tactics wrong, since your credibility will immediately be on the line.
Which only leaves the poor old Officials, since they are the only ones who can't answer back.
Personally I blame the Owners and the FA, the former for not being more patient with their managers (the people they appointed, btw) and the latter for not having more of a spine when their Officials come in for unwarranted stick from tramps like Mourinho, Evans and Warnock etc.