Great! So now we agree that Thanos as presents in the film is completely mad
That’s why he fails so completely as a protagonist and why the film can’t stand on its own.
The film fails because it’s nothing more than a series of, then this thing happened. It’s not a story, it’s a list.
Conversely, when the numbers of a target population have become too great to be sustained by the food or territory available, then predators can be introduced, or a human-mediated cull can be done.
a story is about a character who wants something and has to overcome one or many obstacles to achieve it by making choices that affect the outcome. Thanos wants something and faces obstacles (driving the plot), but his choices are rendered meaningless due to his madness.
Second, animals need to be culled because they don’t have the human capability of reason to find solutions to the problems facing them.
Rational beings understand you can’t snap your fingers and make everything happy ever after.
Umm, the culling model doesn't work in this case because you never just cull once. You have to cull repeatedly, over time, every time that the population needs to be controlled. There's no sense that Thanos is going to wipe out half the universe every fifty years or so just to make sure that things stay in balance.
Yep. In fact, Thanos says explicitly that after doing this, he's intending to retire to some now-bucolic world - probably the one Gamora comes from. And we see him there ate the end of it!
Given the broad audience that doesn't necessarily know about population growth rates, or what the "culling model" is, the movie *really* could have done with pointing out that a single culling won't work. Even better to show Thanos rejecting that logical point. That would have actually made it clear that Thanos is "mad" rather than just an extremist.

That's because the general idea of reducing a population in order to save them (or their environment) _is_ rational, as has already been pointed out in this thread. It's the over-generalization and scope that turns it into madness.I dunno. "I'm going to wipe out half the population of the universe to save it" isn't exactly the most rational of ideas. Do we really need to be explicitly told that Thanos isn't running on all eight cylinders? Then again, apparently so since people have actually argued that this idea might actually have any merit.![]()

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.