yes you're right, we don't need to do anything for this. sooner or later "new money" will come to the market. but manipulation makes negative sentiment on crypto never disappear. I hope there will be firm action on this matter. maybe the SEC can help, but unfortunately the average crypto exchange doesn't come from the US. so it's difficult to solve the problem of manipulation.
manipulation is mostly done by exchanges to attract trade. on average, for new coins registered in large exchanges, there is a system like this. the trading volume looks high and of course, it makes other traders curious about what is happening to the asset.
this will not give such negative sentiment. traders and investors are now smarter and will not buy or trade coins in such exchanges.