Why did Lord Shiva behead his own son?

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Do you know what the greatest thing about our mythology is? Even after having the power to change or create the universe, Our God accepted the destiny of nature. Apart from a few incidents which were backed by reasons, even the Trinity never tried to change or stop it. They endured immense pain and made sacrifices to show us that we must go through hardships, be determined, and follow dharma.
Today, we are going to witness such a story, which features an obedient son, an angry father, and a loving mother. But when you examine the incident a little more deeply, you will find that even the creator endured a lot of pain to follow his own rules of creation, the laws of his nature. This not only teaches us about them but also shows that great powers come with great responsibilities and sacrifices. You will find many instances where the Lord accepted immense suffering to honor the devotion of his bhaktas or Rishis.
After the death of Tharaka Sura, Lord Kartikeyan was appointed as the commander (Senapati) of the Devas. He started fighting against all evil powers to purge the universe of evil thoughts. The battle took years to finish due to the strength of these powerful evil forces. Meanwhile, in Kailash, Maa Parvati was feeling very lonely, yearning for the affection and love of her son. One day, when Maa Parvati went to bathe, she ordered Nandi to guard the entrance to her abode.