Not arguing your point of view just seeing it from a Law Enforcement point of view. If it warranted someone calling in about because they are concerned that something is suspicious it is your job as a Law Enforcement officer to investigate.
For example:
If someone is standing on the sidewalk in front of your house for a long time, over an hour, and you call the police because your concerned and it doesn't look right do you expect the police to show up and talk to the guy? Would you be happy with them telling you that he's not doing anything illegal and their not going to check it out?
Well said and good comparison!