Sad but a never ending cycle.
Everytime we have a flood, cyclone and other natural disasters, we see an influx of people coming to the already over crowded dhaka.
What else could they do!
Dhaka is where the money is, if they can catch it.
Fabi Ayyi Ala E Rabbikuma tukajjiban - فَبِأَيِّ آلاءِ رَبِّكُمَا تُكَذِّبَانِ
Then which of the favors of your Lord will you deny? "We do not deny any of our Lord's bounties/favors upon us."