What you're missing is the value that exists in confirming Andy has said one thing to one person, and something else to another.
As you pointed out, sometimes this means he'll admit to things that are already thought to be "obvious" lies. Knowing this is valuable (even if the alternate story is only repeated to one person) because there is then a record of him changing his story later.
There's a reason TB posts links to images in her timeline. Simply accepting that Andy lies constantly and is not to be trusted is not as compelling as actually debunking his lies, and backing it up with proof.
Re: TW mi/suicide
What you're missing is the value that exists in confirming Andy has said one thing to one person, and something else to another.
As you pointed out, sometimes this means he'll admit to things that are already thought to be "obvious" lies. Knowing this is valuable (even if the alternate story is only repeated to one person) because there is then a record of him changing his story later.
There's a reason TB posts links to images in her timeline. Simply accepting that Andy lies constantly and is not to be trusted is not as compelling as actually debunking his lies, and backing it up with proof.