Was the flooding in Pakistan that displaced over 33 million people due to natural causes, human-caused climate change, or was there extraterrestrial weather manipulation involved to cause intentional harm?

While you are asking as a devil's advocate, so to speak, for the sake of completeness to choose among the list many would assume to be plausible explanations, we can tell you the least likely seeming explanation is the true cause here. Nature is not unkind in the way humans have come to believe in being subjected to extreme weather of all kinds, huge storms that are devastating and often lethal. That is not natural given the intelligence of humans to take shelter. What happened in Pakistan was wholly unnatural in scale, and because human-caused climate change is a non-problem having only a microscopic influence on things despite the propaganda of the environmental movement, we can tell you that by far, the most likely reason for any weather-related disaster is extraterrestrial interference to exaggerate and strengthen a natural weather system to ramp it up to cause severe damage. That is the case here with the tremendous rains and flooding that have been a devastating disruption in the lives of so many human beings. This always takes a toll on livelihood, health, and longevity in ways that are often life-changing or life-ending.