All claims are justifiable. I'm specifically referring to the way written word or verbal speech is, when separate to physical expression, not a concise statement(i.e. is at a high percentage an off-key of what was truly meant).
However, claims can be understood, and understood as right or wrong, for example: I say ' I'm going to make a cross with my fingers ' and then show you; there is a true statement. It can be classed a low percentage off-key.
Thus, it's possible to narrow down claims enough to judge optimistically or pessimistically if they are true or false, but all claims, whether false or true, are justified claims.
It is justified it is data.
It is justified it is true because I've seen it.
Seeing it is a true-courier, thus.
A claim itself is not a true-courier, in fact, because of misinterpretion, even if wholly understood.
What I mean may be wrong but there's no way of judging that through the written word here, lest we were being inconcise.