I'm going to move the cone that someone was using to reserve a parking spot on a street with unrestricted free parking for public.
I'm not sure why you want to do that? Are you having a hard time parking?
I don't have to justify myself to you. I just feel like moving it.
If a parking space is reserved to someone, it's probably illegal to park there or move something that may be belonging to someone else. If you suspect that they're parking illegally, I would recommend you contact your local officials and report them.
I don't think that the police like me.
Breaking the law would not help the police like you. It is best to obey the law and report violations. You'll be happier if you handle things in a legal fashion.