Yes, that's exactly it. When I see these videos, I am terrified.
I (and I don't think you) are saying that there's really someone sitting in an office thinking "We need to make people happy with these robots so people forget how they will be used"... actually wait, nevermind, while that clear thinking wouldn't be neccesary, I think there probably IS someone thinking exactly that. They know they're going to be used for police/military purposes (the research is funded by DoD, and they're already busy marketting them to their likely best customers), and they know not to show that in their PR videos.
Whoever made this funny web page, they made it with videos released by or in collaboration with the PR people for the companies making these weapons (and that is indeed what they are), and they do know what they are doing.
https://www.youtube.com/watch?v=KXnL7sdElno
Sam Waterston would be turning in his grave, if only he were dead and buried.
People are already killed by operators of flying robots.