You can but you shouldn't
If you have editing privileges then its up to you to use them prudently in accordance with the guidelines. The reasons for editing do not include "to fix a wrong answer" in contrast to "To clarify the meaning of the post (without changing that meaning)." While the reasons are not exhaustive the post makes it clear that "changing that meaning" is not one of the things you should do.
If you believe an answer is wrong then vote it down and write your own answer; don't change it.
For this particular question
You're wrong and the answers there are right. You should always be cognizant that your understanding of what is correct may itself be incorrect.
The reason they are right is that neither answer says to destroy it; they say to remove it and return it to the neighbor. It is generally legal to remove trespassing personal property from your real property providing it is done in a way that minimizes damage and does not interfere with the owner's possession, indeed, keeping something you don't own on your property is unlawful.