1. Of the comments that I observed, of late, regarding good plagiarism tool and, the suggestions for the research scholars/writers to be cautious of using these tools, I thought why should we actually depend on this tool, when a research scholar/writer knows that it's written by him/her.
2. Is it because of an apprehension of exact matching (unknowingly writing the same way) of the content in more percentage than what it is supposed to be?
3. If the above two are not the reasons, what else could be the reason for the writer to be more careful while using the tool?