In Israel, kashrus is completely different. There are considerations like sh’mittah, chadash, maaser, chillul Shabbos, etc. that don’t necessarily come up in America. That’s the actual answer.
Now that you have that to ignore, here’s the answer you actually wanted: because we’re dumb, crazy Chareidim and we think we’re so much better than you, but really we’re just crazy and stupid and can’t get over ourselves. Is that good?