That is the case in the U.S. as well. Though many states have "no fault" divorce . . . which is kinda like being severed from an "At Will" employer (where you can be fired for any reason or none). There the court is allegedly interested only in equitable severance, though just like the employer, there is usually some articulated "reason", even if it is a lie.
Best interest of the children should always trump all other considerations . . . what is fair, who's at fault, all of that jive should take a back seat to the best interest of the children. I consider having children one of the greatest joys of life. When I hear someone talk about trying to weasel out of caring for their children, you have to understand, I am reading it and picturing my daughter's face. My daughter who prompts strangers to comment, everywhere we go, "how cute", "how well behaved", "what pretty eyes", etc. The idea of denying her anything just so I could have another toy offends my deepest sensibilities. I can't imagine that changing if her mother and I ever parted ways. That is how it should be, anything else is some twisted materialistic corruption . . . it smells like infection.