Actually I don't. Do you mean "entrap" as in
- "convince to engage in a criminal enterprise which the 'entrapped' person would not have engaged in absent the intervention of law enforcement agencies", or
- "encourage the person who engaged in a criminal enterprise admit that they had engaged in that criminal enterprise by showing them the evidence that you have collected that indicates that they did so"?
The first is something that is not permitted by law and the second is perfectly proper.
If you believe that there is something improper about the second, then you are going to have to write a whole new book on what law enforcement agencies, investigators, prosecutors, and the courts are allowed to do in the legal system since it would be "improper" to convict anyone who does not come forward of their own volition and confess as to use anything other than the accused person's voluntary confession would constitute "entrapment".
If you do NOT believe that there is something improper about then second, then I fail to understand what your objection to it is.