Even so, it is a fact for her motivation; to say otherwise is, bluntly, stupid and ignorant on your part. (Or do you wish to put forward an argument that not only should people be utterly rational/logical, but that they must be?)
Furthermore, is not this a curtailment of free speech? To call it an obstruction of justice to warn people of the consequences of their actions is to assert that learning the law is obstruction of justice.
If I "feel" that Target is selling child pornography, should I then stand out in front of the store with a sign that claims they're doing this? Or should I use my intellect to determine if this is actually the case? To act on one's "feelings" without bothering to gain any supporting evicence is simply irrational.
I tend to dismiss the claims of irrational people.