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Notes -
Sure, you can fuck up everything. As noted in the wiki entry (presuming it's correct), there was no problem with formal proofs; The problem was first going for informal arguments (the start of the slippery slope, though as so often it worked fine-ish for awhile) and then lowering the standards until anything goes. I also think it's notable that the majority of mathematicians has so far refused to accept the Mochizuki proof until it's understood more widely. Both were also mostly localised incidents.
Admittedly I've always been on the more informal end of math myself as well (back when I did research in a field that could be described as mostly-theoretical math), but even there I could simply double-check my conjectures with simulations, which is just yet another way of a feedback with reality.
I think you underestimate the power of proofs. If you make a conjecture, try to write a proof, and not just fail, but you find obvious counterexamples, there just isn't much left to salvage. Or the other way around, if you find multiple different proofs to arrive at the same conclusion and nobody you meet can generate any counterexample or find a clear hole in the proofs. It's true that there is some social element, it would be silly to claim otherwise, but proofs aren't just arbitrary arguments at triviality, either.
I'm familiar enough with the practice of maths (being an actual researcher in adjacent-enough TCS, and having had one foot in extremal combinatorics through a big part of my toil towards the degree), and I think you really overestimate the rigour of proofs as usually written up. The incidents I mentioned are for sure geographically localised, but in the case of the Italians it's not like the situation was that they believed it, and everyone else disagreed; for the longest time it was instead that they believed it, and nobody elsewhere cared but probably would have assumed that their fellow mathematicians knew what they were doing if they had to build upon one of their results.
There are other examples where, due to insufficient rigour of proofs as allowed and encouraged in the field, wrong proofs stood for quite a while. This was the case for like 10 years for some of the earliest claimed proofs of the 4-color theorem (an undergrad assignment actually had us find the counterexample to the core lemma there), more recently for some pretty celebrated random matrices "result" by Avi Wigderson et al. (hardly nobodies!) which stood for several months, and when writing a summarising essay on some cluster of Erdös papers I learned about a key lemma that was straight up wrong as stated, but people in the community thought essentially "something like it is clearly true, the core ideas of the proof are fine, and it's okay for the situation where we use it" (no proof of any of those things committed to paper). Correction eventually happened in the cases we know about, but can we really rely on the mechanism? Mochizuki has intimidated a big part of his department to ignore the refutations, and Japan is hardly a backwater, and there are political forces out there that are stronger than "this guy is one of our country's best, we should stand by him".
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