No, but there are technical mechanisms that provide a high level of assurance in most scenarios. There's a reason iMessage does not suffer spam and why cheating in Xbox online gaming is non-existent.
Treating what your opponents consider truth as hostile is basically presuming they are arguing in bad faith. They may well be, but you may be misinformed.
At any rate, iMessage does not verify that what is said is true. It just weeds out obviously hostile communication.
