It's called racing. Accidents and wrecks will occur. Cars might be knocked into a spin or a wall by another driver. In the end, it all worked a certain way. Denny prevented Chase from advancing at Martinsville (though Chase had a good chance at Phoenix), and Chase prevented Denny from advancing at Phoenix. The only thing you can do is move on and race all other drivers like they race you. They race clean, you race them clean. They punt you into a wall or put you into a spin, let them know you aren't entirely pleased with the matter. I will say this though. Imagine back in 2015 instead of the feud being between Kenseth and Logano, it was instead between Little E and Kyle Busch. If Busch punts Jr. into a wall how many people would call for his head on a spike? Vise versa, how many would come to Jr.'s defense if he wrecked Busch? Because Chase was young, usually calm and collected, and turning into one of the top rising stars for NASCAR (let's not also forget Jeff Gordon won that 2015 Martinsville race as the last win of his career, meaning Chase winning that same fall race two years later would be a excellent twist of fate), most of the racing community (that I saw at least) wanted Chase to take revenge on Hamlin. Heck, what was Denny's home track turned into the biggest booing I have heard of a driver not named Kyle Busch in years. But anyways, it's over, and it's time to put those out of the main picture (they still make good subplots though).
tl;dr It's a new season. Someone will probably rub someone else the wrong way and will be back having this discussion again. Until then, this discussion is nearly 3 months old and might need to be put to bed.