I've been reading for a while, and kept putting off joining, however after reading this I felt I had to put my two cents in. Quite simply, this isn't Disney behaviour, Walt's vision was a place people could go to get away from everyday life, to escape. But to have people parading down Main Street with banners, whistles and chants looks more like something I'd see outside Downing Street. Totally ruining the magic of all the guests.
I work at a theme park myself, and I know that theme park workers worldwide are considered "overworked and underpaid" - it's a common trend. However, striking and ruining a guests day is something that should never happen. I hope that the people who did this are dismissed - there's nothing wrong with striking for a cause, but they ruined an image which is known worldwide, and I'm willing to guess that Disney have it written into the contracts that inappropriate behaviour can result in disciplinary action, including dismissal. I know that the WDW teams have it in theirs, it's in mine, and I'd put what this group did down in that category of inappropriate behaviour.
Out of interest what did the rest of the parade staff do? Was it a mass character meet, or some sort of pre-rehearsed show in case of situations like this? It's nice to see that despite the actions of a few, there are always dedicated people willing to put themselves out to bring the magic back!