I find this questionable.
Because a pump is normally done with some news/rumour and newbies will be buying because they want in.
Then the pumpers are pumping on top of that and the price dramatically rises.
Then they Dump and the price retraces back
NOW if there had been no pumpers/dumpers then those newbies and others buying because they liked the project (news/rumour) and plan to hold would have risen the price that far anyhow.
PROBLEM with pumpers/dumpers: The new people and others buying to hold have to pay a higher price and thus obtain less coin. So the pumpers/dumpers profit on the back of the people buying to hold.
The drop we see now is a combination of the pumpers/dumpers and what BTC is doing which we can see all alts dropping. But safex has dropped a much higher %age thn the alts in general