Well, we see the media, which is disproportionately full of jews and owned by jews, constantly endorsing the migrants. We see groups like the Jewish Coalition for Syrian Refugees working to flood white countries with more migrants. We see politicians who are funded by jewish banks and jewish companies allowing it to happen. And we don't see jews protesting mass nonwhite invasion of white countries. You lot will make some noise about Islam only because Islam specifically inconveniences you; you still care nothing for the right of white nations to secure their own borders and keep their own countries to themselves.

We therefore perceive you, rightly, as a pro-migrant group, because as a group, you are pro-migrant, few of you ever speak out about the actions of your group, at best you'll whine about some of the side consequences (oh no, Islam is antisemitic!) but you'll never come out and say "there are a ton of jews up to a lot of bad shit in the west and they need to be purged ASAP" because a jew always comes before a gentile with you lot.

EDIT: Bobby Fischer was a good jew and a good person in general, and he came right out and called jewry out on its nature and disowned himself from it. If there were a lot of Bobby Fischers in the world people would be more inclined to accept the idea that not all jews are bad.