Sometimes...

• It's fun just to be fun.
• A post is simply too long or too densely packed to read the whole thing, but the general topic is of interest... and a comment without reading the whole post should be just fine.
• A one word comment is appropriate
• Arguing with someone is important to attempt to convince
• The goal of posting is let off steam (no longer steem)
• Being popular is not the goal
• Sharing one's thoughts causes someone else to become offended
• Forced/Enforced Happy Engagement is just not real engagement