The meforshim mention this story is also brought down in the yerushalmi brachos. there it is recorded that he also killed his son, who was trying to protect his mother and he himself was also killed in the struggle.
while you are drawing conclusions, why didnt you also conclude that it is best to shave ones moustache like the amish do. no moustache, no lentils stuck in it. no stuck lentils, no dead wife.
you could also conclude that your husband shouldnt drink wine, or anything stronger, since the gemara tells us they plied him with wine to try get him to reveal where he hid the wallets. perhaps he killed his wife in a drunken rage.