The goal is to end the suffering in the rebirth process.
- The Buddha taught the following: We will not be reborn humans repeatedly (or be reborn in a higher, heavenly realm for eternity). Depending on their actions (moral/immoral), humans can be reborn in higher or lower realms. We can see only one of the four lower realms, the animal realm; the other three lower realms have even more suffering. In addition, rebirths in the low realms are much more frequent. Therefore, there is unimaginable suffering in the rebirth process.
- That is why one would want to end the rebirth process and attain Nibbana.
You have not read my comments or the posts I recommended (or do not have enough background on Buddha’s teachings). If interested, I recommend reading “What Reincarnates? – Concept of a Lifestream” to learn about the rebirth process.