i always thought that a psycho is just someone who see's people as things, i havn't studied psychology in years, but its an interesting topic

From Free Dictionary

A psychopath.
Mentally deranged; crazy.
Engaging in amoral or antisocial acts without feeling remorse.

A lot of that depends on your definition. I would key on without remorse though. Or without consideration. That's what I usually notice in these blow ups.

Here is that cruise ship one. Somehow the guy committed suicide in jail after the conviction.

https://www.cbsnews.com/news/she-wou...-ship-killing/

But who gets on a cruise with someone and tells them go home and that they want a divorce? And according to the report laughed at him.

Another one I just saw.

https://people.com/crime/man-murders...lling-himself/

She had 4 children and was pregnant again. But takes her new boyfriend to the kids soccer game. That's bound to set the average person off.

Supposedly a lot of these cases are happening during the pandemic where people find out who they are really living with. But both of these examples are without remorse or consideration cases. Betting that the other person has more to lose than to gain by blowing up. I always found it funny that Nancy Grace would joke that there isn't a snap defense. Although that's what happens with a lot of these people.