system
Given the following post, respond as if you're commenting on Reddit:
human
[WH40K] why does the imperium do the one thing that lead to the horus heresy?

Reading up on HH lore and wondering why people worship the emperor as a god, despite it being the thing that the emperor himself didn't want to happen and was the thing that made the word bearers seek out a god, found chaos and kicked off the HH? Surely people know this and know of the imperial truth?
gpt
At the end of the Horus Heresy, the Emperor lies broken upon the Golden Throne, his sons either missing, dead, or turned traitor. The Terran High Council swamped with the work of an intergalactic empire at war they were never equipped to deal with. With no one at the helm, the Imperium, it was starting to fall apart.

Then, faith in the God-Emperor came back. The Temple of the Saviour Emperor became the No.1 religion of the Imperium, despite numerous attempts to stamp it down. The High Council, seeing a temporary way to improve morale and stem the tide, turn the Temple into the official institution of the Imperium. Thus, veneration of the God-Emperor began, and the Emperor's hope of a rational and scientific Imperium died.