There is one thing that unites people all over the world, no matter what; our undying need to affix blame on a singular entity. It doesnt matter that most things like this are an unfortunate confluence of random events; somebody or something must be crucified. And you know better than to wonder why people are that asinine; they just are.
I happen to find Delta reasonably agreeable for domestic trips, but let's be a bit more considerate about why negative developments become so contentious these days. An ever shrinking number of US airlines send the vast majority of our nation's time sensitive passengers through a tiny number of ever larger fortress hubs. When even a single fortress hub goes haywire a larger number of passengers are impacted with fewer alternatives than ever before. Add to that dynamic the tradition of treating front line employees poorly. Employees who have few options other than taking their frustrations out on their customers. Customers who in turn can't do anything about their own predicament other than blaming the messenger. The people who have the power to change anything important or expensive (upper level executives at the airline, airport, and power company) are largely unreachable and unaccountable to the people who are directly impacted by their decisions. This creates a situation where the decision makers are insulated from most of the criticism while most of blame is passed around between people who have no practical method for addressing or resolving it.