why AI civil war can make game harder?

[sol_ilya]

If AI begin fights against each other they will reduce their defences, their fleet strength that is greatly benefit to layer. What do I miss in understsanding AI civil war?

[BadgerBadger]

All of the AIs also become much more powerful during the Civil War.

[x4000]

In general, since their production facilities are outside the galaxy, when they go into civil war they start drawing upon more production.  Think of it as being kind of like the AIP going up a LOT, except the AIP is not directed at you.  But you can still get caught in the crossfire, rather literally.