First, I'm Finnish. Now the question.
Everything I can remember seems accurate enough. I can't remember all the older things because it's been a long time since they were taught to me, so I can't really say much about them, but I don't expect many controversies there either (with the possible exception of how the SÃ¡mi people were treated).
Yep, we are such a tiny nation that we have pretty much just been getting shafted by our neighbors Sweden and Russia throughout our history.
We did ally with Germany for a while in WWII, we had our own reasons for it and it's always been openly discussed.
Then there was the civil war, I'm under the impression that the atrocities committed between fellow finns had been somewhat downplayed for a long time, until we were ready to talk about them more openly.
The thing is, human history has been universally shitty, every nation has done horrific things to someone and we should just be glad that we have come such a long way. And there's still a long road ahead.