I don't believe that it was actually done on purpose (but certainly could have), but that plays little role in this case. Billions were lost, thousands of people lost a good chunk of their money (or even all), including myself. It sucked. On top of that, it damaged cryptocurrencies' reputation, because UST was the third stablecoin in market cap.
The impact of UST is very bad for the cryptocurrency market because the negative impact has dropped the market deeper, but however the collapse of the crypto market will be stronger in the future because all the negative impacts are always resolved starting from the beginning of the cryptocurrency market, crypto has come a long way to get better in terms of digital money.