It's a fallacy to claim that tripping is okay because "it evens out." In order for tripping to truly "even out," you would have to take the number of matches played between every pair of players to infinity. If two players played that many matches, then eventually, the number of times that a trip had a negative result for one opponent will equal the number of times that a trip had a negative result for the other, and the gravity of these trips should even out, as well.
But that's not the reality of the situation, that's not the case. Tournaments consist of a small amount of matches between any two players, and it is incredibly unlikely that tripping in general and the potential undeserved gain/loss that results from tripping will be evenly distributed between the players in such a small sample group. One, overall, will have an advantage he didn't deserve. Tripping does not "even out" on a small scale.
It's not enough to say "it's funny." The only amusement I ever get from a trip that results in a death, is sad, despaired amusement that such a horrible judgement call on the part of the developers could've really made it into the final product. The only smiles tripping gets out of me are woeful, regretful smirks of tolerance, because one can do nothing but tolerate the absurd mechanic. A detrimental trip in a match with my friends elicits sighs and rolled-eyes all around, and little more.
Competitive communities seek to remove as many random elements as possible, and tripping is just one, nagging, stupid random element that can't be removed. It has no valid redeeming qualities.