What we usually think of as "tough decision" is that there is an easy and attractive choice vs. a choice that requires sacrifice without immediate benefits. Or it puts conflicting choices in opposition with each other. Typically in that one, the decider has a conflict of interest. E.g. mask mandates in a covid-stricken region probably save a lot of lives and are probably supported by a majority, but get the politician thrown out of office by an angry minority of anti-maskers. So the politician has to weigh staying in office against public health.
In your example there is one clearly right decision and one clearly wrong decision. It's not a difficult decision, it's a moral one (right vs wrong), which isn't a difficult decision at all. Just because thr outcome may be difficult for the decider doesn't mean the decision itself is difficult.
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What we usually think of as "tough decision" is that there is an easy and attractive choice vs. a choice that requires sacrifice without immediate benefits. Or it puts conflicting choices in opposition with each other. Typically in that one, the decider has a conflict of interest. E.g. mask mandates in a covid-stricken region probably save a lot of lives and are probably supported by a majority, but get the politician thrown out of office by an angry minority of anti-maskers. So the politician has to weigh staying in office against public health.
In your example there is one clearly right decision and one clearly wrong decision. It's not a difficult decision, it's a moral one (right vs wrong), which isn't a difficult decision at all. Just because thr outcome may be difficult for the decider doesn't mean the decision itself is difficult.