(in the US) there aren't any specific laws that "encourage" such behavior, but you may be referring to so-clled "good samaritan laws" which shield people wishing to give such aid, from being sued by the very people they are intending to help.
battery
No adult can hold another adult against their will. In most states of the US that would be unlawful imprisonment.
Another name for destructive interference is "negative interference."
Another name for it is wave interference.
They each have different beliefs that often contradict one another, however, they have a commonality in that they encourage nonviolence against one another.
This depends on the laws of the country in which you reside. Generally it is against the law to be married to more then one person at a time.
Another word for squatter would be unlawful resident or trespasser.
A detective or investigator is another word for a person employed to find out information and examine any unlawful activity.
The word illegal means the same as unlawful. Along with this, unjust works. If you're looking for moral based, unethical.
A captor is a person who holds another person captive, usually against their will. Captors may be involved in kidnapping, hostage situations, or other forms of unlawful confinement.
Constructive interference can be a confusing concept when called interference. It is wave interference that is moving in phase with another wave. This causes the waves to for a resultant wave with a greater amplitude. Destructive interference is wave interference that is moving out of phase with another wave. These waves form a resultant wave of lower amplitude.
When a wave interacts with another wave, it is called wave interference. This can result in constructive interference, where the waves combine to create a larger wave, or destructive interference, where the waves cancel each other out.