Political Discourse and Christian Eschatology

Fr. Araujo is correct that scientists recognize that earth is not eternal, but I think there is a fundamental difference between that scientific assertion and Christian teaching.  If it is true that we will one day crash into the sun, that is irrelevant at this point (because it is millions of years away), and if it ever became relevant, then our entire society would devote itself to avoiding the event's occurrence.  Christian eschatology puts the earth's demise in an entirely different light: we (theoretically) want the end of this world to come.  (e.g., Rev. 22:20: "Come, Lord Jesus!")  I know Catholics don't get pumped up about end-times talk quite as much as my evangelical brethren do, but there are public policy implications of prophecy.  For example, one of the "signs" of the end times pertains to earthquakes, storms, and other "birth pains" of the new world to come.  Is it proper for a Christian to applaud climate change as facilitating the end times process?  Or is it proper for a Christian to support a foreign policy that encourages Israel to rebuild the temple, thereby fulfilling other end-times prophecy?

My bigger question for all of us religion-in-the-public-square-advocate types is this: if I'm going to discourage my fellow Christian from basing their political positions on these grounds, should I limit my arguments to theological ones (e.g., they're misinterpreting Scripture), or should I also discourage them on political / prudential grounds (e.g., we can't contribute to the common good by basing policies on a belief that the current world's demise is an unavoidable and good thing).  In other words, are there some Christian beliefs that should be unwelcome in our political discourse?