As said by fillerB, also yarwood has made a similar statement.
"Alright let's get a simple to follow guide here on the above.
Step 1) Someone has entered your property
Step 2) You ask him to leave on a friendly tone.
Step 3a) You try to kill him in PvP-combat.
or
Step 3b) You tphere him to spawn.
Skipping step 2 means using tphere on him is command abuse and will result in a demotion. The trespasser needs to actually be aware that he is trespassing."