The bolded is a reflection of bad drafting.
The average first round pick should last more than four years. If he doesn't, he was a bad pick. Anthony Castonzo just got a new contract; that's what you expect out of a first rounder. Saying that the average NFL career is less than four years isn't really pertinent, as you don't hold every player to the first round standard.
From the first round of the 2011 draft, 23 of 32 players selected are still with the team that drafted them. Another four played considerable roles for different teams.
The Rams might not regret taking Gurley right now, but we're obviously talking about a long view here, not just reflecting on one season. In four years, when Peters and Peat and Thompson and Dupree are in their primes, and Gurley is coming over the hill, that's when the regret might kick in. Maybe Gurley is the outlier, but the odds don't work in his favor.
You want it left alone? Then don't bring it up. You brought it up so it's here whether you want it to be or not. If you still didn't see it or somehow don't get it, there's plenty of pictures show he actually did "show class in defeat" to Manning. If you want more from him in showing class then that's on you, but don't act like he didn't show class in defeat.
You and others really need to drop this "X player would have dove for that fumble" nonsense like you know every thing. Just like every other person on this planet you don't know that. If you want to assume Luck would have and say "Luck probably would have dove for that fumble" then sure by all means go ahead, but don't act like you know for a fact he would have done it.
Now he's acting like a child and embarrassing his team? Now we're just reaching for any hot take in sight.