If they were so friggin’ perfect, why did they die out?
2000 years is a pretty good run, if it really was that long.
Probably outside invaders got to them because they forgot how to defend themselves.
Why they moved was, as explained in the article, due to the Bronze Age collapse climate change which also brought down the Hittites, myceneans and Middle Kingdom Egypt
The Saraswati river dried up, so less easy farming. People abandoned the cities and either:
When the time came to defend their nation, the snowflakes had to run to their "safe spaces".
Perhaps try reading the article?
To wit:
Unlike other ancient civilizations in Egypt and China, the Harappan civilization has no obvious inheritors. When people began leaving Harappan cities in the late 1000s BCE, there is no obvious route that they took. Archaeologists studying the decline of this ancient civilization point to several factors that led to its death.First, there was a rather brutal climate change that began in the early 1000s BCE. Monsoons came irregularly, and the once-fertile valley became parched. Add to this drought the fact that the cities had already been over-farming, and it's likely that starvation began driving people away from Harappa. There is also ample evidence that people in the cities were suffering from tuberculosis and other infectious diseases. The one-two punch of famine and plague left the region depopulated.
Someone who knew how to make war showed up.