Again I'm not claiming that those were my best post, but targeting a user for two consecutive days and deleting almost all of his post is not what I expect from a mod of the bitcointalk.org forum.
Like hilariousandco said, it doesn't sound like anyone's targeting you specifically. It sounds like there are one or more members who are doing a bunch of post reporting, and the mods apparently agreed with the reports against you. I would have no way of giving my opinion on whether yours were low value posts since you didn't quote them, but just take this as a learning experience.
Bitcointalk goes through periods where posts/threads are purged, kind of like crackdowns. When they happen, a lot of members end up with a lower post count than they had before the purge. And I'd say most members here have had at least one of their posts deleted before, so don't fret over it, don't take it personally, and move forward. If someone reported a bunch of your posts because they thought they were of low quality, well, maybe they were. Take that as constructive criticism and try to do better.
Still 12 in two days by two users seems personal with respect to my post deletion history.
That does seem like a lot. I bet you that whoever was doing the reporting went and took a look at your post history and reported a bunch of them.