Your bias is glaring - you stated the land isn't Israel's. By obvious extension, the land must therefore be someone else's and since the only other party in this conversation is the Palestinians - you see where this leads. 

Had you said Israel should not be building settlements on contested land, that would be a whole different argument. It would not necessarily absolve you of bringing bias to the discussion, but it'd be a lot closer than your inherently false statement. 

I on the other hand do bring bias to the discussion. I am a supporter of Israels position on the issue. I can't support the Palestinian position, because I believe that, having no Arab country that would accept them as immigrants, they decided to steal Israels land. They've done a great job of co-opting the narrative, which started when Arab oil states began exerting influence by raising prices. Much better for the world to appease oil producers than support Israel. Follow the money.