Hamas is the closest thing to a real government that Palestine has. Hamas has stated a willingness to accept a 2 state solution, they used to want all the land back but now they just want peace. Some countries like NZ take the time to differentiate between Hamas (not terrorists, political arm) and Qassam Brigades (the terrorist military arm of Hamas).
As far as I have read PIJ is just terrorist who wanna kill all Israelis.