Not sure I agree. In fact I’m sure I don’t.
IMO …
If the high tech visitors want to take over (or just make a lot of lunches), then sure they’ll trash the low tech planet’s civilization and/or species.
But what if they don’t? What if the Prime Directive had real teeth? Or what if, more typically, the visitors show up, speechify for a day or three, maybe hurt a few locals, perhaps even kill somebody really important like a local King, then vanish into interstellar space from whence they came, never to return.
Depending on the planetary tech & social level, that may disappear into local village legend and be forgotten within one or two lifetimes of the local species. For more large-scale connected societies the one-shot interference by the visitors may well alter that society’s future trajectory vs. if they’d never shown up, but that doesn’t prove the visited version will necessarily be a disaster, nor that the un-visited version would not degenerate into disaster on their own.
Maybe it spawns a cargo cult religion, altering the social path forward for many generations until it dies out for lack of reinforcement. Or doesn’t. Jeebus is still rumored to be coming back any day now 2000+ years later.
In any case, real quickly it’ll take on the social characteristics of the local species and society. IOW, even if their new god wasn’t originally made in their image when the god-Kirk was speechifying, pretty soon (a dozen generations?) it’ll be morphed into their image.
Would humans, a febrile and stupid species already under great stress having just graduated from tiny villages to a worldwide connected civilization, lose their collective shit if the [whoevers] showed up, speechified, did some damage whether inadvertently or to prove a point, then evaporated? You bet.
Would all of human society necessarily collapse into an unrecoverable heap Road Warrior style? Nope. Or at least almost certainly not.