Everyone is entitled to their opinion and i don't think anyone's opinion should trigger important decisions as selling out coins you invested in, instead research and make your own decisions on whether its time to sell. if at all are all shit then who's gonna buy even if we sell. just chose your coins wisely, some of them has potential.
That's democracy for you, I guess. I think that one's opinions depends on their own experiences and how the market has been to them. So, those who have good experiences and have gained significant gains and advantages from the market would say that bitcoins, or altcoins of that matter are not scams, on the other hand, those who have bad experiences, and most certainly, those who lost a big amount of money, would be on the negative. Therefore, I would not believe those comments immediately because they can be subjective at best. I think that although many of the altcoins are dwindling in value, there are still some like Ethereum that has improved and gained considerable popularity in the market due to its good standing.