User blog comment:Legionwrex/Why Destroy is the worst ending (besides refusal)./@comment-90.11.117.166-20120814103727/@comment-90.11.117.166-20120814215917

So you let the rachni survive ? They were a threat before and you blindly believed one of them ? As for the krogan I killed Wrex (I can't bare insubordination and so I shot him in ME1), I destroyed Maleon data in ME2 (the genophage was the right choice for the galaxy as Morin explained). So if I cured the genophage Wreav would have threaten the galaxy... Well he choosed his side.

My Shepard believe that when you deal with an issue, you have to be sure the problem won't show up again. So destroy it once and for all (As I told Garrus with Dr Heart in ME1, a bullet in the head solve many issue). But again, I'm a renegade Shepard who killed 3/4 of her team on Torfan to kill batarian terrorist even when they surrender...

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For the Catalyst as you said he has witnessed many cycle, but he can also be wrong (he is far from being omniscient as for example he didn't know the Crucible's plan still existed).

ME show my Shepard that when you're willing to take extrem action no matter the cost, you can beat the odd and do something that was told to be impossible.