If I was in your arena of operations and saw you siding with the enemy I would open fire too.
The complement to "the enemy of my enemy is my friend": The friend of my enemy is my enemy.
This kinda seems like what happened. IRED has been trying to be friendly with both sides of a rather bitter conflict. The side that they were 'originally' allied with (caldari) objected to them being so friendly with the gallente (Particularly qcats, Ew). Combine with a few KMs "proving" that IRED is shooting STPRO pilots (not that KMs mean anything since they don't say who fired first or who was involved but failed to get a kill, and seriously, blue fire happens, get over it) and you've got everything you need to paint IRED as an enemy of the State. If I had to guess, the KMs are just there because someone went scrounging for 'proof' to help back up the wardeck, the actual motivation for which isn't the random kills at all, but oh well.
We have encountered this problem before on all fronts, Ishukone-Raata blued Ushra'Khan and CVA to further diplomatic goals even after a bloody 2 week war, though that being said we have always tried to mirror Ishukone diplomacy to the best of our ability. Working with multiple sides does give an advantage of isk income and added security,
if we are able to create stability in the relationship. We have always had blues in the Amarr, Gallente, Caldari, Minmatar Militia's even during the MDP war in Intaki, our agreements with such groups ALWAYS include a strong stance toward neutrality on all war fronts. Meaning we do not give intel, we try not to venture into military complex's, and even now we are blue with QCATS we have yet to fleet with them.
We were engaged first by Wolfsbrigade, and I suspect this war to continue for several months at this rate.