There's a clear difference though between someone like Zoro and Lucci, since Lucci's less fighting for the World Government out of loyalty and more because being a member of Cipher Pol basically gives him a license to kill.
Zoro fights for a shonen-esque "gimme a good battle" kind of fight, Lucci fights to kill and murder.
Nah, this is not quite accurate. I think you are referring to the scene with Spandam and when he asked Lucci what he wants. The answer was. "Perhaps all we seek is blood. And with CP9 we have the licenz to kill." What is noteworthy is how this is worded. This "perhaps" is something that doesn't really fit in there. It tells us that Lucci is not really sure what his own motive is. Why else adding it?
And this is exactly why I think there is more to his motives than the plain "kill and murder" everyone speaks about.
Also, try to imagine that you are a villager, who was currently pillaged by pirates. You have lost everything and now you are overhearing the conversation taking place in Iceberg's bedroom - what side would you take? Lucci want nothing more than to stop every pirate from robbing and killing innocent people.
This is exactly why I am so currious about Lucci's true motives. And I think there will be a flashback, that will explain everthing: How he became a member of the WG as a child, what Spandams and Spandines plan was after CP9 chased after them and how he got promoted to a CP0 agent after they had failed their mission. And how he and Shaka are related.
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Lucci is not just eager to fight. He likes to kill and hurt people. Zoro doesn’t like that
Nah, explanation above.

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What I want to add is, that Lucci really - Really! - hates pirates. This is why he does everything he can to extinguish every pirate he encounters (Coverstory with the captain of the candy pirates).