I didn't say that the Holocaust necessarily justified the creation of Israel in itself, I said that the Holocaust is why survivors (not merely 'refugees') from the concentrations camps fled to 'Israel' rather than going back to the country where they were rounded up for extermination.
And I pointed out too, that the Holocaust was the Final solution to the Jewish Question. I suggested googling 'Jews expelled from...' to see the number of countries that had banned Jews at some point, including our own. That's why the Holocaust was meant as the final solution to what was considered a long, long term problem. Jews weren't ever going to feel safe in any country because of that long history of discrimination, expulsion and murder. They wanted their own country.
At the same time, there's something profoundly racist about the fact that western countries' solution to the problem was not to sort it out within their own domain, but to impose it upon some powerless brown people instead.
This is a silly argument though. Jews wanted to live in the historic site of Israel. They were, as you detailed, moving there, buying land and property there, wanting a country there long before the Holocaust. How could we sort out 'Jews wanting to live in Israel' in our own domain?
And it wasn't a random place, was it? You, as an atheist, might consider the fact that their God promised it to them is irrelevant, but they don't. It was their homeland. It contains their holy sites. It matters to them.
So two different groups of people wanting to live on the same land = Partition. Like I said, they did it with the creation of Pakistan. They partitioned Ireland. It's not a solution to a problem that was unique to Israel. It wasn't Europe simply looking for a place to offload their Jews and creating a random country plucked out of thin air in which to dump them.
And let's face it, some would like to pretend that Israel was merely populated by European Jews, but around half of them came from the surrounding Arab countries which emptied of Jews in the years following the creation of Israel. Antisemitism and Jewish persecution wasn't restricted to Europe.