You just did by saying they went into the bakery with an agenda.  Many movements started with "agendas", and as such, it should not diminish what happened.  

Gays like to compare their movement to blacks because it is the most relevant movement from recent history which comes anywhere close to what they are trying to do.  Is it the same?  No.  The history of blacks in America is horrifying and not really anything close to what is going on now.  However, can you name me another point in American history when a specific subgroup of people were being denied services based on things like "religion" or beliefs that was not later determined to be unjust?