It portrays a serious extremist group being derailed by the demands of the furthest, most boundary-obliterating, most ludicrous social extremists imaginable at

It portrays a serious extremist group being derailed by the demands of the furthest, most boundary-obliterating, most ludicrous social extremists imaginable at the time. The fact that that group was later considered centrist doesn't make the joke PC, it just means people don't get the joke anymore.