I'm sure it doesn't say ''where's the love'' at all but it's just the ''BLOOD ON THERE'S BLOOD ON THE BEAT'' line that makes it look like that.
I figured it out; So first take a look at that last line from that picture ''BLOOD ON THERE'S BLOOD ON THE BEAT'' typed/written with big letters (from the original line ''there's blood on, there's blood on the beat'') :
below the first 4 words ''BLOOD ON THERE'S'' you'll see it says ''trouble there's'' (from the original line ''there's trouble, there's trouble in town'') with small letters. So, the word ''trouble'' stretches underneath ''BLOOD ON''. The words ''there's'' (small letters) is underneath ''THERE'S'' (big letters) but always one letter earlier.
Now go to the last 4 words of the line, ''BLOOD ON THE BEAT'' (with the big letters) :
the word below/behind the second ''BLOOD'' is simply ''trouble'', pretty much the same thing what happened with the first ''BLOOD'' of that line, the only thing that isn't the same is the fact that ''trouble'' doesn't stretches underneath/behind ''ON''.
In brief, these are the words that are on the picture:
'' on the beat ..... in ..... town
BLOOD ON THERE'S BLOOD ON THE BEAT / trouble there's trouble (underneath/behind it) ''
There you go!