As well, because of their anti-EU stance, they ally themselves with the only other natural option, Russia ;)
If we compare them with other parties, I cannot find any arguments to call them 'radical'.
Perhaps according to Polish standards they ally themselves with Russia. However in this country everybody who does not bi*tching over and over about 'Russian threat' is considered to be Russian ally.
Although Giertych sometimes makes you want to shake your head
Actually Giertych is one of the few people in this party who have some clue. However, what can he do if vast majority are political ignorants (so are their voters)? If he had at least some mainstream media outlets on his side, he could be still in mainstream politics.
Again, nothing the EU can force on Poland.
Because my neighbour is stupid i'm supposed to be stupid as well?
Of course not, the question arise whether in this case neighbour is stupid indeed?
Many Poles know that a vote for him is a vote for a borderline fascist who will deviate from his manifesto faster than Bolt can run the 100m.
Those who accuse Giertych that he is a fascist, usually claim that he have problem with the Jews. In fact nationalist crowds cannot forgive him that he gave some interviews when he looked like a sissy from their perspective.
To be honest, I remember you making few much more controversial comments about the Jews that Giertych ever did. Still, I don't think that you are a borderline fascist.