What are your thoughts on spouses that murder their spouse and why you think they do such horrible act?

I watch a lot of true crime shows and if the husband or wife is murdered then you already know who did it 9 out of 10 times.

What are your thoughts on spouses that murder their spouse and why you think they do such horrible act?
What are your thoughts on spouses that murder their spouse and why you think they do such horrible act?
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