The interesting thing in this thread is how narrow the definition of 'fear' is for some people. Like somebody is only feared if they're Hulk-smashing someone or something. 'Fear' manifests in numerous forms, most of which do not involve violence or the anticipation of it.
The notion Pep or Klopp don't instill fear is ridiculous. Even from their touchline antics tell you: 'do things their way or else' and in a winning team, players are desperate to please their manager and stay in his good graces, for obvious reasons. Being marginalised and alienated in a team that's flying must be a horrid experience and one players wish to avoid.
In a losing team, the fear should be that you'll not be a player at the club much longer unless you buck your ideas up, and this is where we've fallen short for years now.
I think Ole is being underestimated here, also. The bare bones of what he can do comes down to how much authority he is given to clear the squad out as and how he sees fit - there'll be a 'sudden' fear and respect of him as a manager if he's hooking underperformers left, right and centre.
Wayne worked in environments where he saw, all around him, for the majority of his career, how things go for players who fall short of the bar set for them - Rooney was given special permissions and obviously wasn't part of the pack per se until Mourinho arrived, but he did still find himself in the firing line.
Our culture needs to change and the players who are allowed to remain toe the line. Fear will be instilled with that, and not the bench press you through the roof sort.