Sure, some people had different opinions, but no rules were being violated, there was no excessive anger such as screaming, yelling insulting, personal attacks, etc, just people amusing themselves.
This is just the first example I could find, but during the time I've spent since I joined these forums a while back, I've seen a fair share of threads that looked entertaining that were closed for reasons that didn't seem justified to me.
It's flood. It doesn't matter if the idea of the thread is constructive or relevant, and it doesn't matter if the point the person tries to make is correct or not, it's just something somebody wanted to talk about.
Now, guys, there's no "trial" here, I'm just some random member and there's nothing I could do about this in the first place. Don't go into the "prove it or we ignore you" state of mind. This isn't an accusation, it's merely a request that, in the future, before you lock a thread, consider your reasoning behind it and try to avoid closing threads unless they are actually violating the rules and/or causing a disturbance (this is for flood, not the other parts of the forums where it would be appropriate to close an outdated thread presenting a concept, etc, something that is no longer relevant and/or hasn't been posted in for an excessive amount of time and/or has already been solved, such as a question about developing, a roleplay agreement, trading ships, etc).