venomwiththelongna -
But, assuming that he send reports and briefings back to the leaders at home (why wouldn't he?) - if this was the case (which is very logical and sensible thing to assume), it was the leaders, the goverment, the electorate, the higher-ups in charge who failed, and ultimately, failed Seerow.
From what you said, it sounds like as if the rest of the andalites knew that these yeerks were gona turn bad, and that seerow was the only one who didn't. And its true that Seerow didn't know it. If all these other andalites - mainly the gorvernment in charge, did understood how a sentient race of parasitic slugs faced with all this new technology and knowledge could become bad, then they should have ordered Seerow to stop, abandon mission and return home. Simple as that. But they didn't. I'm willing to bet that alot of them, like seerow, didn't know or expect the yeerks to do what they did, with exceptions to people such as Alloran. If seerow is to blame, the andalites in charge are too, just as much.
So it is the Andalites goverments fault for sending Seerow there and not stopping him and calling off the mission. And we know that seerow wasn't acting rogue like alloran at the end of THBC, as he still acted under protocol and accepted to be relieved when alloran cited the protocol for relieving a prince of his command, and then he returned to the planet and wasn't demoted, but was just hated and then sent to another seemingly insignificant planet (hork-bajir world) and continue to make contact with other sentient species there.