And I actually agree with you. I'm absolutely abhorred by how Poland has treated refugees in the years prior to this. Even just in weeks prior, at the Belarussian border - it was an absolute shitshow and I hated my country for it.
But at the same time, I don't think this is helpful right now in any way.
If I had to explain it right now, I wouldn't say it's because Ukrainians are white christians - I think(and this is my personal opinion) that it's because we look at what's happening in Ukraine and we recognize all the awful shit that Russia did to us in the past. Forcing Russian history and language on us? Check. Kidnapping and moving citizens deeper into Russia for "integration"? Check.
I have equal amount of stories from my own family about suffering from the hands of Nazis as I do about suffering done by the Russians.
And then on top of that - that conflict is really close to home, while the Syrian one just.....wasn't. The Russian advance to the West through Ukraine strikes fear in the Baltic states like not many other things.