Your uncle and aunt are right, it is not for any person to cut their own life short by destroying themselves. It sends out an anti-social message that some amount of suffering or darkness we experience does cause us to consciously choose to annihilate ourselves. It's one thing for an individual to do that and send out this message, but by codifying the act into law, it implicitly further tilts us in the direction that so much suffering should cause us to consciously choose to destroy ourselves.

In aggregate, as a society, we've come to emphasize harm-reduction and a sense of fairness to the point of idolatry. They are valuable in their own right, but alone they will see us cascade into sheer darkness. The values for the sanctity and purity of life, the acceptance of authority outside ourselves, and even the difficult question of ingroup integrity will need to come back into balance.