there's a vast difference between only knowing a bit and applying a little thought and only knowing a bit and not applying any thought.

Without thought/consideration, you can hold an obviously incorrect position for quite some time before someone else bothers to correct you, or until you discover the other information.

So, just because you _might_ be wrong, is not an excuse for not applying careful thought to all topics. This is especially true for 'strong opinions loosely held' people who seem to think that loosely holding an opinion is a replacement for putting even a modicum of thought into any given topic. It's not. You hold obviously wrong opinions and rely on people to correct you.