Assuming color force follows a constant rule of force instead of an inverse square rule of force. And that red, green and blue are all attracted to each other.
Why is color confinement considered a mystery?
Any particles which are unconfined will feel a force towards other unconfined particles along great distances making it very difficult for unconfined particles to exist.
(Unconfined electric charges would do the same except the force weakens over distances meaning electric charges could exist separately if far enough space between them.)
This seems almost self-evident. So what is the mystery that people are trying to solve here?
It's even simple enough to run some simulations on a computer with classical particles of color charges and see that they group in colour-less groups.