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Greediness in trading is when you have reached your target but refused to exit the trade and it's not because you saw more potential upside movement from the market but you're just greedy and wants to make more money from the market. We should always be satisfied with the profits we have and take profit first then if you see an upside movement, you can reenter the market. Greediness is the reason many individual has lost so much money to the market.
Greediness makes you to go against trading with caution, and when you don't trade with caution you're putting yourself at risk of losing to the market. As a trader you should always put in precautions measures so you don't lose to the market as that can be very frustrating.
The meaning of greed varies from merchant to merchant. I agree with your opinion that when the target has been reached, traders should immediately take profit rather than expecting a bigger profit. It was greed, of course because they had set a target. So obviously they have to be very consistent with their strategy and have to exit when the targets are met.
But when it comes to holders then I don't think they deserve to be called greedy especially long term holders. They need not give up on the plan if they still see a greater potential for more returns in the long term.