That's what it came down to. Horse racing has been under a microscope lately. Efforts to make the sport safer were even addressed during the NBC coverage today.
Maximum Security was the best horse, but he cut in front of one horse, and almost clipped heels with another one, during the race, thus "impeding the progress" of both. This is why he was placed behind both of them in the final order of finish.
While the second place horse- Country House-filed the objection, the stewards can look at the whole race and rule if something has gone wrong.
They do not want any aggressive riding to occur.
There is a series on Netflix called “Luck” and it is about horse racing. Amazing photography right in the face of the running horses. Not for the faint of heart.
And if they had let it slide, it would have given the nod that Derby races will not enforce all rules.