What do folks here think?
And, as a side topic to this question...
Is it good morals to have a preconceived notion?
I'm not sure you could have come up with two less-related questions!
Anyway, regarding Revelation, no. It's the word of God. Some people's interpretations of Revelation may well be false though.
Your second question is a non-sequitur. They are unrelated concepts. Morals have to do with your core sense of right and wrong. For most people, morals are founded largely on the Ten Commandments: don't kill, steal, lie, or sleep around, and honour your folks. Christians who seek to honour God with their lives find that the Holy Spirit becomes their inner guide as to what is morally acceptable and what is not. That's why Jesus "expanded on" the commandments in His sermon on the mount (Matthew 5 - 7; also in Luke). The letter of the law is inadequate for every imaginable situation, but the Holy Spirit is more than wise enough to guide us in paths of righteousness.
As to whether it's wise to have preconceived notions, we all have them about many issues. What we do with those has significant consequences though. If we constantly live and act as though our PN's are correct, we will likely seem arrogant and unteachable. Better to approach each issue with a willingness to learn, the certainty that we don't know everything about it, and the humility to recognize that we may be wrong and need to change our position(s).