User blog comment:Miskos3/Fairy Tail Chapter 472: Laxus vs. Wahl, Review/@comment-3424593-20160208143435/@comment-7418318-20160208164229

But his friends won the battle. Sure they got mauled in the process, but they still won thus there is nothing to avenge in the first place.

And what good will it do them if Laxus get's himself killed in a failed attempt to avenge them? It is extremely unlikely that he can beat Wahl and quite likely that he'll be very badly hurt or outright killed. And that should matter.

If you have next to zero chance to win for a cause that doesn't really matter (he does it for unneeded revenge, not to win the war or to protect anyone) anyway you're not risking your life, your gambling it for nothing or throwing it away.