CRASH : The market of crypto-currencies loses 21 billion USD the last days...

The recent crash in the crypto market has seriously reduced its market capitalization, which has fallen by about 21 billion USD to a current value of just over 94 billion USD. The crash is the result of a market-wide trend, with 48 of the top 50 currencies recording losses over the past 24 hours. That reminds us how unstable this world is, and that crypto currencies might be framed by regulation decisions to be more trustworthy... But how can we regulate it?
The recent crash is attributed to profit taking, as many traders made profits during the incredible uptrend observed earlier this month, and then sold.

Nevertheless bitcoin seems to resist better than the others. Also it looses less, proportionally to the others, with an actual price of 1 BTC = 2500 USD.