I don't watch those shows, as I consider the awards trivial and irrelevant.
However, I've spent some time thinking about comments made by actors, actresses, music celebs and pop culture figures.
Where I've come down is this: I don't have a problem with them making comments in public or briefly at award shows (as long as they don't delay the program). Each of us has only so many opportunities for public comment. While some of these folks are lightweights and have little basis for their comments, many others care deeply about the topics on which they comment, have done homework on those topics, and devote their time and money to supporting specific causes. In many cases, it also appears to me that they are considerably less partisan than the party hacks from both major parties who do get regular air time.
And the final principle is this: a country in which those comments CAN be made, appropriate or not, is a better country than one in which they CANNOT be made.
Therefore, I'm OK with it.