Keovar, you raise some interesting questions and as our current leader WX Cougar has indicated it will really depend on which member of the group you are speaking to.
My own personal view is that intelligent undead are not alive, however as long as they are not being aggressive and trying to spread death then I will leave them alone. Creatures from other planes of existence are alive and again as long as they are not doing something to infringe upon the rights and lives of others they will be ok.
A tribe of goblins or a xenophobic human settlement, would both be watched for aggressive tendencies. If they began attacking people we would first try and communicate with them, make them understand the error of their ways. If they refused then we would respond with force.