When you make profit, some has made lose and market keep on moving.
True, but the market here is unregulated and like a Wild West. Hence considered more risky than the fiat markets.
I can be against pump and dump if it is a worthless coin made for only the purpose to scam investors.
99% of altcoin projects are that.
Such coin just only pump and dump for life to the disadvantage of hodlers as it may not come up again in the market or get removed from exchange.
PnD is always going to be disadvantageous to hodlers and advantageous to the people doing it. If you are holding some coin which is prone to getting pumped and dumped, sell at the next pump and forget about that coin forever. Bitcoin rarely sees pump and dump that makes its price inflate or deflate too much hence there is no problem of holding it for long term.
It is one of the bad effects of having an unregulated market, you have nothing to do here but accept it and try to use it to your advantage.