Is being defensive a sure sign of guilt or not?

Answer 1

No, being defensive simply means you are actively denying a charge. This is a common response to being accused of something and has no bearing on whether or not you are guilty.

You can field-test by observing a playground of children - watch for when a parent steps in and tries to straighten out a conflict. When a child feels he/she is being accused of doing something wrong, that child will often say "I didn't do that", "it wasn't me", etc. In some cases, the child is being truthful while in other cases the child is lying - in both instances, the child is being defensive.