"Human nature" is always some kind of excuse. Either the person doesn't know enough about what they're talking about and want's to hide their lack of understanding, they just don't feel like putting the effort into an explanation or they really think everyone is that simple and pathetic.
When someone says "in reality" it's extremely condescending. Like they have a monopoly on objectivity. They actually think they're better than you, being as how you wouldn't know reality if it bit you but they can smell it a mile away. BS.
While I do agree with the statement and sentiment it's patronizing and degrading. This is just partisan fuel.
And yet, weve been killing each other for pretty much all recorded history.