I agree. The destruction or desecration of a flag or holy book is in reality a harmless act, yes, but it pisses people off, and generally, pissing people off is not a way to win them to your side. Was there really any government addict who saw this video and then was like "waaaaait… taxation is theft!"
Win them over with arguments. And don't shove the arguments in their faces, but make them easily-accessible when they're ready. That's how the liberty movement eventually won me over, and I know I'm not alone. Were I as I was a decade ago, this video wouldn't have swayed me either.