Why Bother?

Trump recognized Jerusalem as Israel's capital.  Why?  We all know it.  Other countries know it.  No one has publicly recognized it.  They are trying to broker a peace deal.  But by siding with Israel, he is showing that the US is firmly on one side.  Palestinians will not trust our country.  Not only that, but he makes it less safe for Americans outside of the US.  This just piles on to his Muslim ban.  Trump is trying to start a "holy war" for his Radical Christian groups.  They love it.  It scares me.