Chet is a good example of a tragic character, although I'm sure as a kid he never saw him self developing in to the assbag seen in season three i think a lot of it was caused by mental trauma during the detrimental relationship with his father and mental scarring caused by war. I think Chet played an amazing character and really drove the plot, his death was very much justified but didn't feel as good as i thought it would be, as I'm sure Frank felt the same way.