You were removed because your behaviour wasn't of the standard expected for someone as experienced as yourself.
Said behaviour:
Contributing very little to the faction and infact disrupting and upsetting many members of said faction.
Leading completely unfair and possibly 'gank' like raids against other players.
Consistently leaving said faction and returning.
Those 3 reasons are really the core of why you were removed.
Leading a raid that everyone seemed to describe, aside from the larger force oddly enough, as a "ganking", was the last straw.
This is not about you leading a raid against the CR, I don't really give an arse about that, I blast CR folks regularly on my own Outcast characters.
It was the behaviour you displayed towards your fellow players.
It is just a game but you are not the only one playing it.