Ram ne ravan ko kyu mara
Answers
There were multiple reasons for Killing of Ravan by Ram.
Everybody knew this fact that Ravan kidnapped Rama’s wife Sita and that leads to war. Looking on this situation, there was no other way to get victory over Ravan except killing.
You must know that Ravan and Kumbhkarna were incarnation of Jay-Vijay (Gatekeepers / Guards of Vaikunth, abode of Vishnu), who were cursed to take three births on the earth as Demon, when they were doing their duties. On the request, Vishnu gave two options to them and the first option is to take seven births on Earth as a devotee of Vishnu, while the second is to take three births as his enemy. After serving either of these sentences, they can re-attain their stature at Vaikuntha and be with him permanently. Jaya and Vijaya cannot bear the thought of staying away from Vishnu for seven lives. As a result, they choose to be born three times on Earth even though it would have to be as enemies of Vishnu. So Ravan and Kumbhkaran was second birth and as option suggested, they have to be killed by Vishnu Incarnation
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