Why is the lotus flower a symbol of Buddhism?

Buddha's teachings can never be overturned by anyone.

It has been proven that a lotus flower blooms in the mud. Buddha himself was such a being.

Wasn't life before becoming a monk truly stained by desire?

People! just as a lotus flower grows in the mud, but rises above the water and is not stained by the mud, just as the Buddha is born and grows in this world, but transcends the world and lives as its master without being stained by it.