It's sport. sometimes the best athlete on the day doesn't win. I like Nicholson's quote about not feeling like the actual champion and preferring not to win by DQ, but I also like to see the track/lane violations enforced (especially in obvious cases like this).
Sometimes in high jump you'll have the 2nd place athlete clear the final height by several inches and the champ just scrape over, but win on countback. It happens.
Track fans often brag about how our sport has very little subjectivity in scoring. I think running the full distance of a race is kind of important. The World Athletics version of the lane violation rule was actually liberalized a few years ago to not make only single step on/over the line/curb a DQ (college, i guess, used to be based on 2 consecutive steps, but recently conformed to WA by making it 2x in a single race equaling a DQ). I think allowing one mistake (one foot placement out) is that flexibility. Championship meets should follow the rules. If you make the rule much more lax, you'll have more athletes running close to the rail the entire race, and ultimately have more subjectivity and actual controversy.
Just because nobody likes the result, doesn't mean it is controversial.