[JauntyHatAngle]

I don't think your first line is at all true.

Modifying Csvs with notepad is rife. I'd wager more than using any one particular code editor.

[arethuza]

Or they use Excel, which can introduce its own entertaining errors.

A few years back while working on something that unavoidably used large quantities of CSV data we would sternly warn people not to use Excel, but people still did it ("But I just looked at it!").