"We knew this was going to happen" is simply not true? the problem we had was "Oro is maybe interested in us and we should move first", the chapter quite clearly showed that no, Orochimaru was not interested in us.
Oh, certainly, regarding this the anti-vivisection faction (do we really want to explicitly split ourselves into factions here? oh well) was right, I readily admit that. Oro appears to be a compulsive vivisectionist that doesn't see beyond the boundaries of the Basement.
However, that only means this outcome was
even more inevitable. Oro is unstable: he has very patchy knowledge of the world, and an inclination towards reckless, decisive action. This means we don't know what he knows or doesn't know, and can't predict what novel information is going to set him off on a kidnapping spree. And we're a public figure: unless we left Leaf or did nothing important ever, he was always going to hear
something interesting about us.
Say, you think the current predicament is the fault of the hivemind (for inviting Oro to the party) and Hazou (for volunteering information), right? But if Oro were just a little bit more attentive, or had a higher opinion of us, or if some random scheme of Kabuto's required it, or if the Snakes had more extensive lore, Oro would've come for us the moment he heard about the Great Seal replica. As it happened, yes, Hazou directly convinced him there was more to it, but the fact that Oro didn't take it seriously to begin with was by no means a given.
And this is just one example. If he didn't already have Sadaharu, he probably would've went after Noburi for the Summon Army. Or he might've heard about Snowflake from an unrelated channel, made some assumptions, went after Kei, and she would've spilled the beans after getting Intimidation-100'd, just like Hazou. Or he might've, I dunno, been walking down a street while Akane and Yuno were sparring on some nearby training ground and noticed that one of them seemed to be absorbing blows as if she had non-ablative armor.
The core issue here is that we don't even know what counts as "poking" Oro, except that it's
incredibly easy to poke him.
Basically this repeated 100x. The "don't poke Oro" strategy was working and would have continued to work until Hazoupilot poked him. Everyone saying not to confront him about the GS was just vindicated, Hazou had no business talking to Oro about it in the state he was in.
You're walking a tightrope suspended over a burning landscape. There are strong wings blowing throughout, messing with your balance. Occasionally, a bird would fly by, and you would lunge for it every time, for you've been walking for days, and are starving.
Eventually, you fall down.
Was that outcome in any way unpredictable?