I'm of the opinion that you have a very naive view of the world. The charade that elected governments play may fool you into thinking that it's full of incompetent people, but I'm pretty certain they are able to play complicated 4D level chess at the state level, at least if history is any indicator.

You keep focusing on the simple 51% attack vector, but nobody is stupid enough to attempt something as obvious. These government actors are experts at silently muting, crippling or destroying countries - what makes you think they woulnd't be able to do it to a disorganized open source project?

Whether it'll happen is a different question though -- as you identified, the game theory at the geo-political level complicates any single actor's motivations.