Not to disclaim Britain's & France's atrocities in China - but blaming Mao's victory on those is simplistic at best. China is not a cardboard NPC village, where nothing happens unless the PC's visit and start pulling strings. And while various Chinese people may find it convenient to say "because $western_country did $thing", 99% of actual Chinese decisions are made from their own motives, for their own benefit, with minimal-at-best regard for Westerners.