No I disagree with that although it certainly hasn't hurt. People forget that after WW2 there were 200,000 US troops stationed in Europe, bit of an additional problem if you fancied yourself as the next Napoleon or Hitler. WW2 changed the whole European perspective entirely. Plus UK and the French had nukes by the 1950s. There is not really much point in starting a war with a country that can just nuke your cities if they start losing the conventional battle.