Similarly, if you hold opening a bottle cap on shabbos is a melacha, if someone else opens it, that is as far as you are concerned that is Melecha. Whether you can use it or not depends if you define the doer as a shoggeg or Maizid
Given that the classic two examples of Shogeg (WRT Shabbos) are:
1. The person didn’t know it was Shabbos (i.e. they thought it was Friday)
2. The person thought the activity was permitted on Shabbos
… how can you say that the doer is anything BUT a shogeg, when they clearly fall into the second category.
The Wolf