Now, this does not sound very important, but it actually are one of the most critical things that needs to be addressed. We should counter all of these misinformed people, with education on what Bitcoin is, because they lose money on Ponzi schemes and then they blame it on Bitcoin.
Bitcoin shouldn't be blamed in such cases, because even the dollar can be used in a ponzi scheme. Maybe the level of anonymity Bitcoin offers makes it attractive for scammers and ponzi scheme operators. However, I think Bitcoin will be more controllable in the future in terms of transaction senders/receivers, whereas we can see that the mixers are targeted by many governments, and the US recently asked all exchanges that operate on their land to share their information of all crypto currencies transactions with the government. I see this case as helpful in tracking all types of scams, including ponzi schemes, yet it could harm the privacy of users. However, Bitcoin will always suffer from the criminal activities it's used in as a means of payment, so it needs global recognition and regulation in order to have a unified law to track scammers.