The hardest thing about shit like this is you'll never really find out why but I agree with your wife - you can't try to apply logic where there wasn't any.
I get it DSG. I hear it from my wife all the time stuff like this happens. I'm an analyst and it is my job to figure things out. So, I'm wired that way.
As mentioned, some things cannot be condoned or justified, but understanding why or how is possible in my opinion.
I just think if we have certain pieces of information we may be able to understand the situation a little more clearly. Then again, when information is missing we do not understand the complete situation.
I was watching American Sniper the other night. I still do not understand why Eddie Routh killed Chris Kyle. Then again all that I know is Routh had PTSD, but that doesn't explain why it happened, but I'm missing pieces of information.
Also, the Uvalde mass shooting. I have not studied it, so I'm missing pieces of information and therefore, I do not understand why that POS killed kids.
I see your point in trying to apply logic where there is none, but when you have most or all of the information I believe you can formulate an understanding. Just my point of view. I believe my wife would see it your way as we have not talked about this particular case just yet.