It is your intent that matters here.
Were any of us in your situation, we would all bring a different perspective and way of assessing this; there are only two end results (in the context of the question - killing or not killing), but the number of paths we go through in reaching the results will be as many as there are who take the journey.
Everything has a reason and a purpose - even the catalyst served up to you (and vicariously us) by the ant in your house.
Whatever you do, it will be ok.
The degree to which it is STO or STS will depend on the intent. It may be that you need to work out the issues you will run into contemplating the dilemma you think you are faced with.
Were any of us in your situation, we would all bring a different perspective and way of assessing this; there are only two end results (in the context of the question - killing or not killing), but the number of paths we go through in reaching the results will be as many as there are who take the journey.
Everything has a reason and a purpose - even the catalyst served up to you (and vicariously us) by the ant in your house.
Whatever you do, it will be ok.
The degree to which it is STO or STS will depend on the intent. It may be that you need to work out the issues you will run into contemplating the dilemma you think you are faced with.