Well as interesting as a bunch of anecdotal evidence is, actual scientific research suggests that fighting has no positive effect on the outcome of the game. The ol' eyeball test is good for finding a date on a Friday night, but if you want to find the truth about real world phenomena...you have to use science. Bummer.
"We can see in all four of these data sets that there is no evidence that winning a fight leads to better results in the immediate aftermath of the fight. In fact, it appears that the team winning the fight will score slightly less goals in the game than they did previously. In all four groups, the percentage of goals scored by the winning team is within 1.96 standard deviations of the percentage of its total goals scored, indicating that the results are negligible. Thus, we cannot reject the null hypothesis that winning a fight has no impact on a team’s momentum and goal differential."
So, I guess, our overall conclusion from this study isn't completely certain. We wind up with a summary like:
1. The effect doesn't seem to exist for run-of-the-mill fights. 2. When a goon fighter on a goon team fights when his team is down, it seems to benefit that team by 1/8 of a goal, or a bit less than a normal power play. 3. But, that effect isn't statistically significant, so we have some doubts that it's real. 4. And, with only 364 such datapoints qualifying out of around 5,000, only a small percentage of fights match the criterion for that kind of boost.
If you had to reduce that to one line, it might be: At best, there might be a small effect in certain specific circumstances ... but much, much less than sportscasters make it out to be.
Ok we get it. You don't like fighting. Ad nauseum.