A Zettelkasten is a tool to extend someone’s mind to a realm where working memory is not an issue. As such, it is often referred to as a Second Brain since it represents a mind and thought map of oneself.
To truly be useful in that context, it only works if every idea — no matter how elementally obvious or controversial — is allowed into the Zettelkasten. It is only there in the context of “more established” thoughts that we can begin to process these fleeting ideas and feelings.
The ideas we give attention to are the ones that thrive while the ignored ideas wither and die. This becomes visually apparent in Obsidian’s graph view. There is no reason to think negatively toward thoughts and ideas that no longer resonate.
Extending this idea to journaling, we should expect to find raw and honest thoughts and feelings that don’t necessarily reflect reality.