The leviathans created stupid squared, that achievement is so impressive as to be on par with the citadel, but then you remember what it actually is and it just seems impressively stupid.
The Leviathans are orders of magnitude worse than the Citadel, and far worse than stupid
2. The humans got it right in-story, they are
fractal stupidity; a self-perpetuating and self-replicating system of stupidity that is itself built out of smaller stupidity, and the closer you look the stupider it gets. They successfully managed to fuck themselves over so comprehensively that they rendered themselves effectively functionally incompatible with
reality itself, and then they rendered the self-fucking permanent in such a way as to make it literally impossible to undo without outright recreating the entire species from the ground up, basically wiping the slate clean and starting again from scratch.
Literally the only ways the Leviathans could have made things worse is if they had accidentally programmed the Cruicible to spread to other galaxies as well. If they had somehow managed to break the universe entirely and destroy reality, that would arguably have been an improvement because it would have given a new universe a chance to form, hopefully one without Leviathans in it.
The Citadel on the other hand, are just perfectly traditional corrupt politicians engaging in corrupt politics. The scale is larger than normal, and some of the people are blue skinned alien space babes, but otherwise it is business as usual.
But impressive in all the wrong ways.
Exceptional achievements in the wrong direction are technically still exceptional achievements. Though the terminology typically used under those circumstances is usually something along the lines of 'singular' or 'unprecedented'
Aka: 'I am impressed. Horrified, traumatized and disgusted, but impressed.'
33 is, in fact a perfectly valid sample size for an initial, tentative conclusion. It's entirely possible that even after the creation of the reaper system they continued to see more and more instances that reinforced their conclusion. Namely AI rebellions all over the place... because reapers are synthetics and their own hostility to organic life was literally designed into them by the Leviathan AI. It's something of a classic example of garbage in/garbage out in a self reinforcing loop.
We have stuff like this today where we are unintentionally creating racist AI because the data we feed them is from an inherently racist system like the US criminal justice system or just because facial recognition teams are using mostly white faces to train their AI. Doesn't matter what your sample size is if said sample is not impartial and untainted.
Actually they aren't; Reapers are
cybernetic, a mix of synthetic and organic; their 'brain' is built out of a hive-mind of assimilated organics rendered down into a genetic slurry that somehow still retains the ability to think (and scream). They only
look like synthetics on the outside, something that they take advantage of to trick the Geth (and presumably other synthetics in prior cycles) into serving them, but their cybernetic nature is why they consider themselves to be 'above' or 'greater' than purely organic or synthetic life-forms.
Said cybernetic nature is also vitally important to the whole 'upload civilizations into a storage state as a holding pattern' plan, as the people goo is what contains the full genetic profile of the original species and thus is what can be used to recreate said species in the event that a solution to the whole 'synthetics keep murdering their organic creators' problem can be found. The minds stored in the people goo then contain the information about the original civilization which can be extracted (whether the minds have gone insane or not doesn't matter, the information can be retrieved regardless, the sanity of the minds is irrelevant and expendable) which, combined with the genetic data, can be used to restore at least a vague facsimile of the original. Which is (theoretically, according to the Catalyst) better than the nothing that would be left if they were wiped out by killbots.
Each Reaper is basically an extremely violent and opinionated squid-shaped flash drive containing a compressed and encrypted organic civilization, waiting for an unspecified point in the future where they can be unzipped and extracted back to meatspace with the StopGettingKilledByRobots.exe update applied.
At least, that is how the Catalyst sees it.
(As mentioned, the Catalyst is an
idiot.)