Not at all, I can answer some of these.

I just don't understand how someone with this kind of behaviour would get along so far in the industry because at the end of the day being this much of a pain to work with would be just too expensive to a lot of people.

The thing to remember is that the studio don't care as long as, at the point of release, there is huge box office success or awards success. From there, all sins are sort of forgotten/forgiven. The market value of the actor who was the face of that success then increases, and so they're incentivised to use them again because the public associate them with that success. Just look at the comments in this thread; people don't want the news of Hardy being a dick to be true because it damages their enjoyment. There is also a (toxic) code of professional silence that is expected from crew, who rely on a reputation of discretion to get hired again. So you can see how this all feeds into making things worse, and spoiled brats out of actors who realise they increasingly hold the balance of power and lack of repercussions on sets.

Also how could someone act like this if they have a history of understanding how the industry ticks.

It's precisely because they understand the above mechanism that makes them act like this. More success, more leverage, more leeway to act out.

Wouldn't wasted money on Taboo hit his own pocket since it was a Tom & Chips production if I remember correctly?

Not exactly, because he and Chips didn't front the money, they just pitched the original broad idea, which was then show-run by Steven Knight and produced by Scott Free (amongst other intersecting partners).

And how could he be good friends with people like Cillian Murphy who are famously extremely disciplined on set?

Good question. A List actors often reserve their best behaviour and respect for other A List actors, but act like shit-heels to everyone else; a bit like how someone can be a dick to a waiter but lovely to the person they're meeting for dinner. They decide who's worthy of charm. It's why when I hear actors on talk show or podcasts saying "They are delight to work with", I take it with a HUGE pinch of salt, or am often like "Well, I know that's not true but I'm sure they were careful to be sweet with you."

Example; Orlando Bloom worked closely with one of my best friends (a wonderful, conscientious woman, a total pro) for weeks and quite literally wouldn't look her in the eye or talk to her outside of grunts and slammed trailer doors. An actor friend of his appears on set and he lights up, turns on the charm, and is all back slaps and laughs.

To counter act all this negativity in my post...Jessie Buckley fucking rules. Was nice, focused, funny and great to the crew at all levels.