So, are they suppose to lie and just say that nothing happened in 2018? They need to show the pros and cons of entering this world. They can't just show the "good side" when everyone was making money in 2017 due to the bull run, they need to show not only that but also the bear market in 2018 (as well as the legit coins and also the countless scamcoins in the market) so that those who don't understand how this market works can get a better understanding of the crypto market.

But I don't think showing what happened in 2018 would be as bad as you think, if anything it'll warn newcomers to not invest recklessly their money, I doubt it would cause a new downfall or anything like that.