Ligers are no more insane than house cats. Like all predators, their pleasure center is entirely too close to their killswitch and they've got world-champion-class mood-swings. You'll be petting one and it will be purring and then it's ears will go back and you better move your hand or it will draw blood...
In my (admittedly limited, sample size, two) experience ligers are *less* difficult to deal with than full-blood tigers, which have a startling capacity for holding grudges. (A lion or jaguar seems more likely to lash out when provoked, and then immediately lose interest, or even express regret and 'cry' about lashing out at their caretaker (we had one starve itself after being dropped off by the owner who'se arm it had broken, she had to drive sixty miles to feed it, and it would make moaning noises when she left, she ended up having to make a big show of 'forgiving it' and take it back...). Very unpredictable. A tiger will put up with a certain amount of abuse and not seem to care, and then turn around one day and spemd a several minutes very deliberately *killing you*...)
My grandmother raised various big cats (and other animals) for animal parks, including lions, tigers and jaguards (no bears. I fear bears.), and social (like lions) or solitary (like tigers and jaguars) makes little difference when the animal is raised by humans. Hence circus trainers having lions and tigers in the same act, and sleeping in the same cage, despite the solitary nature of wild tigers.
Just about every liger you'll see will come with the hollow admonition, 'Oh, we didn't breed this deliberately, it was just an accident that we had the cat in heat in the same cage with a male of a different species...' Yeah right. If there's an animal trainer dumb enough to not know when his couple thousands of dollar worth of revenue-generating livelihood is in heat, and what's in the cage with her, he's already been eaten by a grue.
Note how few tigons there are. If the preponderance of show ligers were truly 'accidents,' you'd expect there to be an equal number of tigon 'accidents.' And yet, tigons aren't terribly great audience draws, and so that sort of 'accident' never seems to happen. One show I attend regularly tells the exact same 'accident' story that they've been telling for years, only they're on their third liger. (Big guys don't seem to live that long, or perhaps they aren't really made for the fast-pace of celebrity life and all the coke and showgirls wears them down...)