True ignorance of plagiarism while creating a piece of writing is, to a point, excusable. Putting it out there without checking your work, however, is not. With current detection tools, nearly all mistakes of this nature are extremely easy to catch, and increasingly, there's no justification for failing to do so.
For the last two months I have been interviewing consistently. I appreciate for many that that in itself is a success to celebrate, especially in my chosen field, until you see the dedicated folder I have for rejections and the excel sheet I keep of ongoing applications. However, a worrying trend is emerging.