some of the ejections are for repeated rule breaking (ie. Emma last year), but a lot of the ejections are for physical confrontations or violent or aggressive behaviour.
in general though far more confrontational houseguests are cast for BBUK than in America. also nowadays production gives the houseguests alcohol much more frequently and sets up tasks that will elicit fights.
Honestly, it's probably because you really don't know what you're getting yourself into. It's hard to grasp if you're not in that situation, but production purposely casts people you won't get along with, or your personalities clash because they want to see how you would react to them. And you can't escape them, like IRL you meet a cunt and you go your separate ways or try to see them as less as possible, but in the house, you're trapped with them with very few places to go.
The atmosphere is also different from BBUS, and recently US hasn't had many fights, but in UK it seems like theres 1 every other episode
Most of the ejections are because of the infamous racism situation that went on during one season which involved Shilpa Shetty and Jade Goodie. That got so many complaints that since then they have been so strict with rules that someone is bound to get ejected at some point during any season (when it's civilians).
