>> Engaging in any act that, in Blizzard’s sole discretion, brings you into public disrepute, offends a portion or group of the public, or otherwise damages Blizzard image...
It says : "Blizzard is a commercial entity and it doesn't want to be involved in anything else than gaming".
For me Blizzard acts in a very corporate way. There's nothing wrong with that, provided you accept the corporate way is the good way.
If you think Blizzard's action is wrong, then just don't abide to their rules.
Blizzard has no moral, it's a commercial entity and it makes whatever compromise needed to expand its commercial activities.
Let's talk about that on the next tournament, just to see how the rules have been updated.
(try to express political opinion inside Disneyworld, just for fun)