Egyptian spiritual descent

http://theoriginaltestament.blogspot.com/2018/04/egyptian-spiritual-descent.html?m=1

Someone i'd met at this year's seder had asked a good question:
how come the jews in egypt had fallen into 49 levels of impurity?

Didn't Yoseph and Yaakov 'pave the way' when they came to Egypt, establishing schools and settling jews in the jewish enclave of Goshen?

so if that's the case, why have the jews fallen so quickly to such low level?

While i don't know the exact dynamics and the reasons for their spiritual downfall,
we see in recent history how just two or three generations of communism in Russia have almost totally destroyed the jewish spark of Torah...

 So we see that unless we actively FEED the flames, they just... die.
Everything needs to be NOURISHED, especially our souls!