Because the advantages provided by 3 globals and a several advanced field armies aren't enough?
The following is not diplomacy.
Remember I trail at third in most graphs apart from the giant chaff armies. However I'm obviously no speed bump and invading me at this point would be a very bad move, because any party that attempted this (with or without the aid of a theoretical thrid party) would then be left weakened facing said third party.
Obviously I notice that the same applies to certain parties and see that hostilaties agaisnt such parties would be detrimental before some theoretical third parties are marginalised, through seperate but cohesive action on multiple fronts.
Oh and in regard to the indiscriminate weapon I am using. Realise that it is intended to a) Prevent the use of the same by theoretical third parties b) Destroy key components in the advanced armies of theoretical third parties c) Deal little damage to certain economies like say blood hunting and the use thereof.
*Whistles*