I don't know what your cultural background is, but certainly in the above scenario a fellow Pole would have probably congratulated his efforts to resist arrest
What??? Maybe his "buddies" from the block would do that, but certainly not majority of Poles (and especially not women).
Although I don't think he would be dangerous to her daughter (or to her), the fact that she gives shelter to a dodgy character is certainly worrying and displays poor judgement. She is definitely not a typical Polish woman, more likely one of pathological background where excessive drinking, resisting arrest and convictions for assault are a norm.
The fact that she asked OP to stay with her on this night is encouraging though, to me this would mean that she is not playing mind games (possibly didn't feel comfortable with the guy alone) and perhaps sees that what she is doing is not quite a norm. I don't think that her being from low social background should should rule out potential relationship (if OP is prepared to accept differences), but certainly a lot of work ahead!