My recommendation would be to actually take the time to read about this case. Sleuthing involves educating oneself on the various pieces that are involved, it's not just about making up random scenarios and throwing them out there to get a reaction. All that does is dehumanize the person who is being discussed.
There's great information in the articles, things like the fact that there was no water in the pond, and that Shana suffered from mental health and substance abuse issues. I find that when I actually read the details on a case, my thoughts about it become a little more relevant.
Why a retention pond? Why anywhere? People take their lives by (I had a whole list of examples here, but chose to remove them as it felt like I was just being graphic for shock value) -- why would anyone choose anyplace to do those things? If people killed themselves according to some rational, logical set of instructions then it would seem we'd have a better handle on how to help them instead of standing around stunned after the fact.
No, I don't see any dilemma.
Property Owners' Legal Duty to Prevent Injury - FindLaw And I certainly don't see how putting up a sign that says "This is a pond" would deter someone from proceeding on with whatever intended action brought them there in the first place. Medication comes with all kinds of warnings yet people will ignore those warnings and swallow a whole bottle if that is their chosen method of suicide.
www.google.com
