If he wasn't so obsessed with straight denial, it's a workable debate- it's not as if post-war Britain has a reputation for caring and fair colonial administration that was willing to leave peaceably, and it was only just after a period of mass civilian bombings and nuclear weapon use. If you want to make an ';ends justify the means' argument, then the case is at least open for someone to try and make it. It's a morally complicated area.
There is of course a potential irony in comparing it to Palestinian groups, but it's a bit blunt actually to be ironic for me. It's just how oppressed groups work.