

Is it good to be peaceful? And how do you keep the peace?
Because... (A long story is about to come out, if you want to skip to further questions, feel free to

I was just minding my own business and peacefully ran out of titanium (will need to work out titanium management, because this seems to be the only resource that gets scarce in later game - maybe you can lack duranium as well, but that proved to be okay for me so far)
But then suddenly Heyoun tried to bribe one of my member minor races. No success, but I still pre-emptively built the communication stuff that increases bribe resistance to 4000.
Well, I finished the building in time, but not that it matters. Several turns passed and... Only one more try (or two? I don't know now) made them decrease relations and cancel the membership (feels so unfair considering that I couldn't bribe his races even though I tried 20 times). Since then, I couldn't give metals to the minor race as a gift... Only credits. And what is worse, I couldn't even bribe them. Well, in the end they not only declined my second membership offer, but they also joined Heyoun instead! :'(
So I began to say, screw the peace, and began mobilizing battle fleets. My upkeep costs flew sky high immediately, from 3600 they went to 4900 and even went red for a turn (I don't know why, since my income was still 7000 credits per turn).
But well... Something weird happened. Truth is, Heyoun had been powered by the fusion with the Omega Alliance. But...
My military power was way above the average.
I had three Alliances (all except Rotharian - cooperation - and Omega) against Heyouns' two (Khaoron and me)
I was allies with Heyoun, so their sudden betrayal really boiled my blood
And last but not least, they couldn't even get to my toes...
But the Heyouns issued a demand on me! They asked me to give them 1350 credits or else...
Well, that was enough.
I decided to declare war at them. So I issued a war pact with Khaorons and with Cartare. What is the result?

Well, it turned out to be a completely unexpected result. I am used to the diplomacy of GalCiv and Master of Orion. If you have an alliance in those two, your allies give you the option. Either declare war or break the Alliance. In this game the Alliance is the union of Trade, Cooperation and Defence pact (which is quite funny, because you don't need as much of a relationship for the mentioned union as you need for the Alliance itself), which means that you automatically declare war when someone declares war to the ally.
And we had this interesting scheme.
Me: Ally with all except Rotharian
Heyoun: Ally with me and Khaoron
Rotharian and Cartare: Defense pact.
And this is where it gets interesting.
So Khaorons declared war to Heyoun as a result of the war pact.
Then they declared war to me as a result of the Alliance.
Then I declared war to the Heyouns, but the Alliance is still active for now
Cartare declared war on the Heyoun as a result of the war pact
Then to me as a result of the Alliance
The war between Heyoun and Rotharian occured due to the defence pact between Rotharian and Cartare
Same happened between me and Rotharian
Due to the Alliance between me and Cartare a war between Cartare and Rotharian occured.
And last but not least, the Khaorons declared the war to them as a result of the alliance with me.
To make a long story short, everyone is in war with everyone on a whim, from being all happy together.
Overall relationships decimation, only Cartare dropped from Enthusiastic to Neutral, the rest is hostile now.
As is written on the pic, I gained 10 morale for war with Khaorons and lost 12 morale due to the war with Heyoun, even though both were my allies.
But why there were no other morale effects for war declarations?

Are there any chances of saving the world peace by being all diplomatic? Or will the opposing empires go on rampage sooner or later?
Do the enemy empires seek peace or do they just fight if the wars are long? Somehow they seem to try to save themselves from extinction by offering last minute treaties, but that's about it...
Is there any way to cancel the war apart from closing other treaties?