I think it was a slightly different take: the gangster saw politics as a corrupt business which can be bought or threatened like any other business, and refused to listen to subordinates who warned him that the IRA are fanatics and thus in a different league. (In that, the film was again prophetic: the IRA did prove to be a greater menace in London, too, than the gangsters of the 1960s ever were.)

I read the film failed to find a distributor for one year due to the IRA angle.

_{*Lunatic*, n.
One whose delusions are out of fashion.}