You know, I used to be like this too. Left my regional as a FO to go to a major and then tell those at the regional that they should go here, do this, do that, apply there. It took me almost 3 years to learn, but I finally realized, it just isn't my damn business to tell other grown men what they should or shouldn't do in terms of working at an airline and where they should go. They are all grown ups, who can and will make grown up choices, and it is not my business to judge them or their personal family situation. Right now you're in the "holy #@$% I'm at Delta!" phase. Give it a few years and IMO you'll be eating the same slice of humble pie that I took.
I'm at a LCC, the happiest I could ever be, thoroughly enjoying my career, and I wish nothing but the best for ALL regional pilots (yes, even Endeavor) and hope that each and every single one of them obtain their personal career goals - and wish them and their families the best.