Yes, you could indeed go on and on! There is definitely no shortage of questions on this or any other SE site that could be considered sketchy, but we as moderators can't always act on every single one of them. We are volunteers who try to spend as much time as we can looking over the site and trying to keep it as current and relevant as possible.
Quite honestly, I personally do not ever read about 25% of the questions on this site when they are first submitted because I simply do not have the time. I eventually get around to reading all of them, but sometimes it may be a week or so after they are posted. I can't speak for other moderators, but I suspect they do not see most questions on the day they are submitted. (New answers are even harder to keep up with, but I won't go into that right now.)
Because of our limited time, we rely on the community to help bring our attention to potential problems. They do this by voting to close a question or by flagging it if they believe there is something that needs to be addressed. Pretty much every single day I look at every question that is flagged or voted on for closing or reopening. Questions or answers submitted by new users are automatically flagged, as are answers to older questions, so all of these get my attention first.
The short and simple answer is that this question got flagged and voted for closing, while most of the other questions did not. When we receive a flag, we have to make a decision based on a number of factors, and sometimes it comes down to just a personal evaluation. We are not always going to satsify everyone, but we certainly try.
Again, speaking for me personally, one of the first things I look at is the number of commenst vs. answers. This question has 9-0, which means it easily falls into the category of one that will likely solicit debate, arguments, polling, or extended discussion. Those are easy decisions for me when it comes to a request to close!
Another factor I consider is the number of votes (up or down) for either the question or any answers. Pretty much all of the examples you gave have good participation from the community, and as a moderator, we will very rarely do anything with one of those. At some point in the future as we get closer to becoming a full site, we will be required to clean up a lot of those or remove them, but until then the moderators are not going to act on them.
We don't claim to have the perfect solution. It is simply one in which we rely largely on the community to help give us guidance. All of these factors are weighed individually (and quite honestly, sometimes with some personal prejudice) before we decide how to act on them. As long as the community remains active and provides their feedback, we will be there trying to help mold this site into what you guys want it to be.