Apple implemented an anti-theft system under their own control, even when shipping x86 platforms.
Any other x86 OEM could have done the same, instead of handing control to 3rd-party CompuTrace / LoJack / Absolute.
As HP says in the document at the start of this sub-thread:
If the [Absolute] product is currently enabled, the risk is someone else is in a position to lock the system, wipe the drive and/or retrieve files.