Pump and dump is part of crypto trading, every coins including bitcoin pump and dump. To avoid this, buy when it is low and sell when high. Flow with the tide.
Yes your right, the pump and dump is normal even in other investment like stock, they have also pump and dump. Anyways, to make profit from that situation i think is better to buy low ( like you said ) and hold, and decide to sell when you gain a more profit for what the coin or altcoin you buy.