That's not true at all. I don't believe people are naturally good, I believe they are naturally assholes. Being nice to them is just the most reliable way I've found to avoid bringing out those inner assholes.
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I know so many people who had relationships like this and got married because 'it was time'. No love between them, really, just a weird animosity. The same people who see a relationship that's years in and healthy and go 'Enjoy it while it lasts!' and tell people that they're dumb to get married and 'will understand someday. Like yes maybe the marriage or relationship won't work out, but we didn't go into it hating each other from the jump?