@Ramya nice observation. But you need to understand that when Shiva unites with Shakthi destruction will happen. To elaborate it further we need to understand that the world and the Gods were at the mercy of Adi parashakti or Parvati because only she could bring back Shiva back to family life. Parvati took the hard path to get Shiva as her husband not only because of her immense love, but the world needed her to do it. Because Tarakasur was making mayhem with the boon that only the son of Shiva could kill him, knowing fully well Shiva after the death of Sati is leading an ascetic life. Devas tries by hook and crook to make Shiva marry Parvati using God of love. That plan failed miserably with Shiva burning Kamadeva. But Parvati's true love finally wins over him and dharma is established in the world as Karthikeya was born and killed Tarakasur
Enemity had to happen between Ram and Ravan. Ram had to Ravan. Dharma needed it. Shiv Dhanush only became a medium. Sita united with Ram for that purpose, creating jealousy in a man who saw a different woman in her.
Same is the case with Draupadi. Krishna needed her to establish dharma. She had to be send to Arjun. And she has to flag, the fires of enemity more so that ultimate aim of dharma is established.
Bhishma taking Amba, ambika, ambalika from their swayamvar opened up avenues for Krishna to take Rukmini as well as send Subhadra with Arjun. In star MB it is with this point Krishna counters Bhishma when he questions Subhadra-Arjun marriage. If Bhishma used might. Krishna needed Rukmini to kill Shisupal. Shishupal had to die from Krishna's hands. But Shisupal's mother made Krishna promise her that he will pardon 100 sins of Shisupal. Krishna wanted to make Shishupal commit that 100 sins, what better way for that to take his beautiful bride from the mandap on Swayamvar day. Shisupal reacted, went on insulting Krishna and finally got killed during the Aswamedha in Indraprastha. The finger wound thus happened is tied by Panchali from the piece from her silk robe and it is said the clothes she got during vastraharan was Krishna repaying her for that single piece of cloth she lovingly tied to his wound without thinking she is tearing her silk robe.
So understand that marriage is a union of Shiv with Shakthi and at the onset of itself whether we realize or not the process of destruction to something will also start. When the marriage is based on dharma, on the freewill of both partners then it destroys the right things to bring balance in the world, when the marriage is not right, it is forceful, then wrong things gets destroyed creating imbalance.