Has it ever occurred to you, Jewish Destrudo  and the others on this site bitching out the intermarried, that people aren't likely to listen to you if you adopt such a harsh, hectoring tone and use violent terms like "stabbing in the back" and "decimating"?  Other commenters on this site have used the terms "second holocaust," thereby implicitly comparing intermarrying Jews to Nazis.  Not exactly the way to outreach to your fellow Jews, or to fulfill the mitzvah of ahavat yisrael.

Intermarriage, regrettable though it may be in some ways, is here to stay, and you can't browbeat people out of doing it.  It's a free country.  Better to conduct positive outreach to intermarried couples, showing them the joy and pleasure in living a Jewish life, rather than taking the oy-yoy-yoy-you're-a-shandeh approach which died out with Tevye the Dairyman.

Try more loving, less hating.