User blog comment:Legionwrex/Why Destroy is the worst ending (besides refusal)./@comment-1388547-20120707004302/@comment-899316-20120707010702

If I remember correctly, in Control, the Catalyst is completely replaced by Shepard. As for whether or not Shep can be trusted with all the power of the Reapers, I direct you to my comment from earlier.

''Well, that all depends on a few things. Like who your Shepard is. If you play a power-hungry, Renegade, half-demonic jerk, chances are power will corrupt him/her. If you play a super-Paragon, defender-of-the-universe type, things may go differently. In the end, you just have to ask yourself whether or not your Shepard would stick to the galactic guardian thing, or go mad with power. There is, however, another factor.

When Shepard is turned into the new Catalyst, the shift is pretty massive. Shepard is no longer a short-lived mortal, and is in a position where they can truly look at the big picture. Their mental horizons have been expanded so greatly as to make them almost a different person from the N7 gunslinger they once were, as Shepbinger reminisces in the epilogue. It is entirely possible that mortal concerns like power are now beneath him/her.''

As for the validity of the synthetics vs. organics conflict, I think the Extended Cut has made me believe in it a bit more than I did initially. As you said, the Catalyst, and AI, forced its creators, organics, to become the first Reaper against their will. The Starbrat is living proof of the conflict. The peace between the quarians and the geth was only made possible by upgrading the geth to such an extent that they became actual individual beings equivalent to an organic. That would not normally be possible. In fact, it was done with Reaper upgrades, and in Destroy all Reaper tech is, well, destroyed. That effectively makes it the only ending in which there can't be peace between organics and synthetics.

As for Shepard's warning, I doubt very much that society would heed it. People ignored Shepard before, and even with the galaxy at stake some continued to do so. Furthermore, there is empirical evidence that galactic society does not learn from its mistakes.For this evidence, I direct you to yet another of my prior comments.

''We have no guarantees of cautiousness in the future creation of synthetics. In fact, we have proof that the galactic community rarely learns from past mistakes. The salarians messed up royally when they uplifted the krogan, causing a bloody war and having to nigh-sterilize an entire race, yet they're considering doing the same thing with the yahg as of ME3.''