There must be a balance — a fine line — between being a daft doomsday prophet, and giving God's actual words of warning, in these last days. "Both prophet and priest ply their trade through the land and have no knowledge." Dejavu.
I get tired of these Christians — brothers, yes, but going to extremes and making God's word of no effect. Inaccurate escatelogical interpretation is ugly and can often tamper the interpreter's witness, as well as the witness of the Christians around him. God's Word is not a game.
But I need to be careful to not be like "the prophets prophesying lies in God's name" when I'm trying to set straight a brother who seems to be hyper-prophetic. I need to be careful never to go against God's Word, only the error. Sometimes, I have the tendancy to go the opposite extreme and become apathetic to the prophetic Word. God can speak through a donkey and the donkey's pagan prophet owner, and God can speak through a messed up Christian.
And the lying prophets who said "all is well, all is well" were just as much God's prophets as Jeremiah was. But only Jeremiah listened to God's voice. There is a worse judgment waiting for the erring prophet, than for those they've mislead.