Friar Laurence is usually seen as a kindly character who advises Romeo and Juliet, helps them get married, and tries unsuccessfully to avert their tragic fates at the end of the play. There's plenty of textual evidence for this interpretation, and such a reading would not be wrong. However, it's possible to view Friar Laurence in an alternate light. Indeed, the Friar could be blamed, at least in part, for much of the play's tragic happenings. First of all, he's the one who agrees to marry Romeo and Juliet secretly in the first place, and one of the reasons he does so is because he wants to help ease the tension between the warring Montague and Capulet families. Second, he convinces Juliet to drink the potion that makes her appear as if she's dead. As we all know, this potion works, but it also leads to the tragic deaths of the play's protagonists. As such, Friar Laurence might not be as helpful as he seems.
There are two alternate readings here: first, we could hypothesize that Laurence actively wanted to sabotage Romeo and Juliet's love. While this idea is possible, it's also pretty unlikely; it's hard to read Laurence as entirely evil, no matter how you interpret the text. A more likely interpretation is that Laurence is not a helpful counselor, but is actually an inept character whose attempts to "help" Romeo and Juliet do more harm than good. In this alternate reading, Friar Laurence becomes less of a valuable counselor and more of a misguided fool who is responsible for most of the play's final catastrophe.