I was playing a custom neutral race with the yor tech tree (if that makes a dif). Game started out fine, I was allied with the Yor. The Yor went to war with someone and I broke the alliance because I didn't want to go to war in the first 3 weeks ><. A few turns later the yor declare war on me, so I start wiping them out when I had researched enough military tech and suffered countless yor atks. Halfway through attacking them they ask for peace. I'm not going to accept this cause they're evil, going to end up breaking the peace etc etc. SO I wipe them out completely and all is well.
I scrap all my military ships because I'm not at war with anyone and had good relationships. A few turns later the Torrians relationship with me dropped (didn't notice). They said "We gave the galaxy the warp drive and feel you have abused it" or so, and declared war. Another few turns later the Drath and Arceans both said "We have to stop the war machine" and declared war on me. And another few turns later the Thalans declare war "We have to stop your war machine".
I had good relationships with all these races and then they all make alliances with each other and declare war on me claiming I'm causing to much war even though I had no military ships... why? 
Is it because:
- I broke my alliance with the evil Yor (who were attacking the Drath, yet the Drath start attacking me later)?
- I didn't accept the Yor peace offering for obvious reasons?
- Or possibly... because I had 3 scout survey ships flying around in other civilizations territory (they only had engines and survey module...)