Going into their house is morally wrong ... it's a dehumanization based on ideology
Let's dial it back a little. Reel your neck in just a touch.
It's no one's house per se. It's a church. Most churches are open to the public. This isn't a home invasion. No one has been hurt.
It could be said to be valid, if somewhat loud, protest. Considering how Scientology has with great intent in many cases forced itself onto others, how its tax-free stratus makes it a drain on public coffers, and how it has openly used the threat of financial ruin to coerce ongoing membership.
Now, that is likely a little biased too. In the end I suspect the real truth is that this is little more than pranks and copycats of pranks. To get "morally repugnant" from this is turning up the volume so much that what you are getting is little more than microphone screech.
Not much worse than the kind of pranks which were simply par for the course on any given Halloween not long ago.
My advice to them (the scientologists): next time one of them sees the kids, invite them in, help them film, and ask them if they'd like some refreshments after. That'll take the air out of their sails more than moralistic teeth gnashing.