"Why because people dont like it "  
who are we ?? some find it distasteful other could careless  and Ive been in Law enforcement for 29years not going to cry about a painting  
Because it's based on a lie, and it paints heroes as pigs and murderers.  I'd like to see your reaction if I hung a painting at the US Capital, that showed blacks as monkeys who only stop doing drugs long enough to cash welfare checks or rob white people.  Because that's roughly the mirror image of that painting.  Neither has any business hanging in the US Capital.
Some police are heroes and some are murderers .. you clearly dont the understand the image of a cop is not about a White or Black person its about the  institution ..your example above in no way mirrors the other painting  yours is only about race 
"where was the outrage 7 months ago "
Who cares?  I got outraged when I first heard about it, which was this week.  I'm sorry that I didn't know about it 7 months ago.  
I care its another manufactured outrage, a stunt that was sent to your inbox and you ran with it .
"Forget the law of the land   
I never, ever said forget the law of the land.  I said it's interesting to me, that liberals are OK with this painting, but not of a nativity scene.
 t
the 2 are not the same but keep thinking they are and only liberals hate nativity scene's  the high court have ruled   you should read the law Nativity scenes are not banned or hated 
http://www.pewforum.org/files/2007/0...isplays.pdfthe 
"stop telling half truth "   
majority of American people believe see you think that to be true based the same thing happen 8 year ago its not earth shattering 
Now who is wrong on the facts?  I'm not just talking about  the Oval Office.  The GOP controls both houses of Congress, a large majority of state governorships, and a large majority of state legislatures.  Go ahead and tell me, is that statement true or false?  and 2018 is shaping up to be another landslide for the GOP, look at which senators are up for re-election, and in which states.