lol. Not true at all. According to wiki, 87 people have died in one piece, including one of the main characters of the SH Pirates.
I'll list a few.
Gol D. Roger, Fisher Tiger, Otohime, Kuina, Bell-mère, Dr. Hiluluk, Tom, Jaguar D. Saul, Olvia, Joy Boy, Monet, Vergo, Mr 11, Ace, White Beard, Merry, Scarlett, Thatch, Tsumegeri Guards, and Yorki
Some of those characters listed were from flashbacks to develop other characters. Some of them were to develop the plot. Some of them the villain of the arc killed. And some of them were villains that have died.
Is that enough deaths for you?
Probably not because you would say something like they were all fodder and didn't die in the current story line, or they weren't the main heroes or villains of the story.
Well you want a list of the protagonists that have died in One Piece?
Ace
WB
Merry
Brook
Sure one is a ship and the other is just bones, but they count.
How many protagonists have actually died in Naruto?
Hiruzen
Asuma
Jiraiya
Neji
Anyone else was an antagonist that turned good, was a secondary character, or died before the main story.
4 and 4... Naruto sure has a lot of good people dying all the time. So much more then that other manga One Piece.
Ok but Naruto has killed more people then Luffy has right?
..............
I count zero for both.
No wait, the other characters around the main character has killed people before right?
Strawhat Pirates, zero.
Sakura.......zero Sasori let himself die by the granny
Sasuke. Orochimaru is still alive, Deidara blew himself up, Itachi died of Aids before he could kill Sasuke, and Danzo blew himself up.
Another big fat Zero.
I guess the argument should actually be if villains should die more in One Piece because lots of villains in Naruto have died(unless they turned good).
Even though Oda said he would not kill the antagonists because he felt them losing their dream after getting their ass kicked by Luffy was worse than death, he actually has killed of antagonists recently(Vergo and Monet).
Actually I find him not killing off the villains has been better for the overall plot. Let's take a look at all the major villains Luffy has beaten instead of dying.
Morgan. Used to develop Coby as a side character.
Buggy. He basically made it possible for Luffy to escape Impel Down and is now a Shichibukai serving to better the plot later.
Alvida. Partnered up with Buggy to beat Luffy. Currently is in charge of the Buggy crew in Buggy's absence.
Kuro. Got his ass kicked. Serves no point of being alive atm.
Don Krieg. Got his ass kicked. Serves no point of being alive atm.
Arlong. Got his ass kicked. Serves no point of being alive atm, but was used later in flashbacks in Fishman Island.
Smoker. Still in pursuit of Luffy and was used as an ally on some occasions.
All of Baroque Works Agents. Mr 2 and 3, huge assets in Impel Down. Robin joined the crew. The rest are used for future encounters.
Crocodile. More Impel Down and Marineford stuffs.
Enel. Used to develop the whole moon thing in the cover pages.
Lucci. A possible gambler seen in Punk Hazzard. May be of use later but unclear.
Moria. Foreshadowed to be seen later but has yet to be.
The Admirals, Self explanatory
Hody. He was imprisoned and made useless. The King got to deal with him for his satisfaction.
Cesar Clown. Currently being held captive by the SH's
Donflamingo. Yet to be seen if he dies or not.
Basically all the villains have been used later in the series or will be, minus the East Blue villains at the beginning of the series.
Versus Naruto's villains who basically just get revived by Edo Tensei to further the progression of the plot....
Let's take a look at the Villains Naruto has fought.
Haku and Zabuza. Died and revived by ET to say he became a good ninja.
Random people in the Forest of Death. Still alive, haven't been seen since.
Kiba. Turned good
Neji. Turned good
Gaara. Turned good
Kabuto. Still alive, started a war and abused ET.
Orochimaru. Died then revived, then died, then revived. Maybe good.
Sasuke. No explanation needed....
Kakuzu. Kakashi killed after Naruto kicked his ass with plot.
Nagato/Pain. Died by a book....
Obito. Turned good and still alive.
Madara. Most likely going to die.
The rest of the villains someone else fought and killed. Most of the time it was a grown up.
I mean comparing the lists, there isn't much of an argument saying Naruto villains were killed off when half of them turned good and the other half committed suicide. Most Naruto fanboys seem to neglect how these villains died and just compare deaths numbers.
When it comes to meaningful deaths, One Piece takes the cake. Jiraiya is the only one that comes close to being as impactful as Ace, Merry, and WB were. Mainly because he wasn't revived by edo tensei. As flashback deaths go, Minato and Kushina were really the only ones where One Piece has so many good deaths in flashbacks.
As for the topic at hand. I'm sure there is something in this post that relates to what you want.