As far as I know we just don't know what the thumb gesture was for certain. And even if thumbs up meant kill 'em, (which might be... I think the believed most likely symbology was uncovered thumb = death, thumb covered with other hand = spare 'em) you could still spin the message of display so it's not completely goofy... "better to get your 'bloodlust' out on a big artsy projection than to make the state a murderer", or "now the thumbs up means something good, times have changed", that kind of thing. It doesn't work as well as the most likely symbolism, but it doesn't fall apart.
I think it looks pretty cool, actually.
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