system
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human
[Pacific Rim] Why did people think that the Kaiju were just stupid animals?

Newt says that "we thought they were dumb animals" or something to that effect, just mindless, violent beasts that blundered their way through the breach.

Why? Didn't people find it strange that these dumb animals were all deliberately attacking cities instead of just wandering around and bumping into a city occasionally?
gpt
Because they *were* dumb. At first. 

After the initial attack on San Francisco, the USGS was able to backtrack Tresspasser's path to its origin at the Breach using seismic records. Turns out  it had been wandering around for weeks in a kind of drunkard's walk pattern until it reach the US West Coast. 

Hundun, Kaiceph, and Scissure all were shown to have followed the same pattern when their routes were backtracked. In the onslaught that followed, it was observed that Kaiju only went straight for population centers after another had first stumbled into it.  

That in and off itself didn't necessarily prove they were intelligent. It seemed more likely that the Kaiju were attracted to the  scent of spilled Kaiju-blue. The thinking was that they followed it because it meant the Kaiju that had lost it was dead or weakened, and therefore its territory was now up for grabs. 

That's why the city walls seemed like such a good idea at the time construction started. The more we fought the Kaiju, the faster they came, and the bigger they got. A more passive approach would mean less Kaiju-blue spilled, and that would hopefully stop this exponential spiral of bigger Kaiju showing up faster. 

Jaegers, though effective, were expensive to produce and maintain, and we were just about at the limit of our production capacity. It was only towards the very end, once the walls were almost up and the jaegers decommissioned, that the apparent intelligence of the Kaiju started increasing exponentially along with their size and frequency.