If you ever have seen this:
And wondered where it all comes from, Brian Craig commenting at Bad Vestments provides the answer and some trenchant commentary:
The left-wing puppet aesthetic goes back to the 1960s and Bread and Puppet Theater, which performed at all sorts of protests and featured a giant Uncle Sam puppet. Given that many of these current Catholic dissidents cut their teeth back then, it’s easy for them to have borrowed the idea.
And as for using them in churches, I guess it’s the same as breaking into a missile plant and spray-painting graffiti. The mentality is to go right to the source of what you’re protesting. You’re right, however, to point out that it shows a complete loss of understanding of what goes on in a church, especially at Mass.