It isn't, because I don't know long you've actually read OP, but remember the thousands of people killed by Enel's Deathpiea? Oh wait, everyone survived. Or how about Aqua Laguna was going to nearly wipe out Water 7? Wait, no, people were fine. Oh, wait how about the people cut to bits by the Birdcage? Oh wait, no, people were fine, too.
Whether you like it or not, this has been a long-standing writing style of Oda. Obviously people are going to be fine and our heroes aren't ever going to seriously die from a foe. If that's a problem for you, so be it, but don't bullshit me and say it's recent.