TBH this is because the main victim of plagiarism is usually not the original author. The usual case is some student doing it to gain a qualification, and the v

TBH this is because the main victim of plagiarism is usually not the original author. The usual case is some student doing it to gain a qualification, and the victims are the people who trust that the qualification was obtained honestly and the other students who took the time to do honest work only to be out competed by someone more "productive". There, the person copied probably does not know or care. Here, where it's done in a published work, the original author can be aggrieved that they didn't get a citation (or in rare cases, royalties) but mostly it's the publisher and readers who are being let down. I guess the main case where there is a serious injury to the original author is where they were not famous and the plagiarist is, and the original author gets suspected of being the plagiarist