Someone asked why most people think the opposite of this principle — wanting to make others adapt to them, instead of adapting themselves to others.

A good builder of perfections must be someone who thinks only of improving themselves for the better, adjusting themselves to fit with others — not trying to force others to fit them. That most people think the opposite is because they're being guided by the unwholesome. The wholesome teaches us to adjust ourselves; it teaches what is right and good; it teaches that we cannot force anyone — what we should do is be a good example for others. The unwholesome, on the other hand, teaches us to control and dominate others to satisfy ourselves; when things don't go our way, it makes us rage, because the unwholesome's aim is always to harm and destroy. It often finds ways to disguise itself as good intentions — "I only say or do this because I care about you" — that's the unwholesome's method: claiming good intentions while actually harming and oppressing others.