bitul simplified

Question

Hello, One of my rabbeyim taught me that if a goyishe manufacturere purposely mixes treif with kosher, it is botel beshishim. to the that seemed clear and simple, what does he know or care about bitul, he does what he does because he wants to do it. so that the issue of bitul of ingredients on pakages of manufactured items , all those comments are nonsense, the mixture happened and it had no intention to make treif kosher. yes , no? I HAVE TO ADD THAT THIS COMES FROM THE MESHIGAAS DRILLED INTO OUR ASHKENZIC ANCESTRESSES THAT TREIF IF LIKE A DANGERIOUS ELECTRIC CURRENT TO BE AVOIDED AT ALL COSTS. DROP OF MILD ON A PIECE OF MEAT, NO SHAYLES, THROW IT IN GARBAGE. IF I WOULD READ A BOOK AT THE DINNER TABLE DURING PEISACH SHE WOULD SHOUT IN YIDDISH, ES HOT GELEYGEN IN CHOMETZ, IT HAD BEEN WITH CHOMETZ, AND AT THAT TIME IN HER LIFE SHE WASNT EVEN SHOMER SHABES, BUT HER CHASIDIC MOTHER, WITH A SHEITEL, AND VERY LITTLE KNOWLEDGE OF TORAH, HAD TAUGHT HER THIS. that is why you get this incessant questions about bitul, since "we" know that anything that has any association or derivation with treif, has become treif, despite the shulchan aruch saying kosher. as one rebitzen told her husband, if i listened to you the house would be treyf. the ikkar goes, the tofeil remains