Against someone who political program and reason to exist is to destroy you ? How ?
Their reason to destroy israel is because it oppresses them. Palestinians have very clearly shown to be open to negotiations. These get shut down by israel because israel wants to expand their Lebensraum.
Case in point is the West Bank where peaceful Palestinians consistently get terrorized by israel. And Hamas is now starting to grow there.
This might come as a surprise but almost nobody is going to risk their lives fighting when they are not being oppressed.