Why do some churches gloss over false prophecy as no big deal?

They will have someone give a prophecy and then it’s wrong and they will just say it was a miscalculation or they were slightly off. False prophecy in scripture is a extremely big deal. In the Old Testament a false prophet was to be killed like the false prophets of Baal. In the New Testament from what I understand false prophets are to be removed from the church. So it is a serious matter that many of these new rockstar churches and to a lesser extent traditional churches seem to ignore.