I once hold a coin and suddenly the coin that is almost $1 dump to less than $0.01 to me I move on but to some people which are newbies this can discourage them from participating in crytocurrency and make them conclude it is fraud and that brought me to a question how do you think pump and dump group are damaging crypto-currency and it's reputation??
If you quit cryptocurrencies because of that, then you are not mature enough for this business and it's better that you stay away. You should learn something from such situation and study the coin before you invest in it. If the price is raising without reason and coin is overrated, than you can know that it's just a pump and dump and you need to be aware of risk. If you're buying some shitcoin just because it's growing than you will soon regret it and it's completely your fault, not fault of pump and dump group.