My hypothesis is that most immigrants do not want to leave their home country. But if they cannot find peace and opportunity, they reluctantly move away.
My maternal grandparents left Bukovina in the 1920s. I have put a little of my grandfather's story in my most important article on Medium:
https://medium.com/tiered-democratic-governance/the-tdg-essay-cf48e4b4a1eb
I visited my maternal family in 2006. One of my mother's cousins had big tears when he saw me.
Many of us are amazed at the resolve of the Ukrainian people and the willingness to endure its current trauma. When the war is over, I hope Ukraine finds a more sensible system of governance.