Ignoring for a moment that the video just has some dude talking and is not actually footage of it happening...

Churches are probably the least defended of potential stores of resources, since they rely on conscience and public outcry for defense, so taking a peek wouldn't be particularly risky.

For the conflict, any reasonable person and organization should have gathered at least some supplies in case they can't get to a store for a while, and I wouldn't expect a church and its community to be any different.