I can understand why Ron might not want to talk to LE, based on some perceived bad experiences early on. It apppears that he has taken offense that he and/or Misty may still be regarded as possible supects and are being treated accordingly by LE.
However, the whole objective of LE is to determine who took Haleigh and to find her. The feelings of any other parties, including her parents, is of secondary importance. Ron should view LE as being correct for putting Haleigh first, even if it means they have to do their job and make a parent uncomfortable. He has far more to gain by cooperating with them and being proactive in staying in constant touch with LE. In fact, being a pest would probably be a far better tactic.