How many rounds of ammo he had is not really relevant (unless he used all 26000 rounds of ammo or was in the process of using them).

That he killed the wife in front of the kid… that is relevant.

No we must make it looks like the guns made him do it.

Well the guns enabled him to (allegedly) shoot his wife but it doesn't seem like he was planning to make 26 000 holes in her.

But who’s to say he wasn’t about to kill 25,999 more people? Think of your children!

/s