Delta has given back a ton of money to shareholders, and of their selves. Which is fine. They brag about it while trying to get the pilots to take concessions. Not fine.
If this were a legitimate concern, there has always been a way to fix it: become a shareholder and assume some risk.
I consider Delta and SWA to be far and away the two best US-based carriers, and their overall performance pretty much proves that out. However, I can't stand the commuter airlines, so I usually pick SWA since I know that I'll be on a 737 with a crew that doesn't act like they hate their jobs and hate the passengers even more (my last experience on a Delta commuter).
I haven't encountered screaming kids on SWA except to and from Florida, but it seems that they are flying fuller flights than they used to, and have more business travelers in the mix. Or, it could just be the present-day karma that some people have that puts them on lots of flights with screaming kids.
JKG