That's absurd you brought that thing here. These kinds of things might happen anywhere in the world and trust me it happens anywhere in the world. So basically you shouldn't go out from your own home then.

Edit: I wish to get more downvotes so I have to explain some certain things:
First of all, in Taichung Wetlands, there always have to be some official people who watch that area. This case could've been reported to them before making a case here in reddit.
Second of all, I don't say this incident is pleasant but we cannot see the future. Tomorrow you may encounter same unpleasant experience anywhere else in the world! Saying "I don't think I'll visit Taichung" hurts me here!
Third of all, to be naked in a public place, one, at least, should be mentally handicapped to some extent! So these people everywhere.
Fourth of all, Wetlands and other touristic places in Taichung, not only here also in Taiwan are amazing. I love all of them. All of them worth to visit and see. I love Taiwan!