Base siege or not, that's way too much overkill for two cruisers. I'm ashamed to see the SCRA partake in such actions as well when I know they're to be held to a higher level of standards especially since it was a Civillian target.
I've explained a million times that base sieges never float everyone's boat in terms of the pvp prior. They had to have known they were getting in hot water when they came to fight. It's not like I fly my snub into a crowd of Rheinland lawful wraiths expecting them all to sit out while I kill them "fairly" one by one. That's ridiculous.