It's pretty easy to argue in retrospect that photon torpedoes would have been suspect because the DDM had already demonstrated the ability to "neutralize" antimatter.
Of course, back then, we didn't know that photon torpedoes relied on antimatter, but nowadays it's pretty much a given. Or at least we can rest assured that most photon torpedoes have antimatter warheads, even if the name just possibly might refer to something else than the warhead type.
For that matter, why not aim the phasers "down its throat?"
have decided that approaching the beast from the front would be an absolutely idiotic idea...