Yes, they are aware of this, but there are many examples of physicists failing to grasp the full significance of this fact. There is a difference between physicists acknowledging the CPT-invariance of fundamental laws, and fully embracing the philosophical consequences of this invariance. Huw Price's Time's Arrow and Archimedes' Point documents a number of cases of physicists failing to do the latter.
For further examples, see the mess of a priori causality conditions and chronology protection conjectures in GR, largely motivated by a desire to avoid "causal paradoxes". Tachyons are declared unphysical for similar reasons. So-called retrocausal interpretations of quantum mechanics, a very promising research topic IMO, are largely unexplored. Advanced (as opposed to retarded) solutions to differential equations are ruled unphysical. I could go on.
There is still a big unwritten assumption in theoretical physics that proper scientific explanations must account for things that happen now in terms of things that happened earlier. I can't think of any reason for this bias beyond an attachment to causal narratives.
see the mess of a priori causality conditions and chronology protection conjectures in GR
Classical GR actually rules out changing the past (while allowing CTCs), despite the common misconceptions about it. The Novikov's self-consistency principle was self-admittedly a way to say "there is no new physics other than GR". Hawking's famous chronology protection paper mainly showed that QFT cannot be done in the standard way on a wormhole background.
Tachyons are declared unphysical for similar reasons.
They are generally "declared unphysica...
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.