See points 2, 3, and your last point. Any facts to back those up at all? Not saying you're wrong, but there's a lot of people who pop into this thread and make blanket statements like those with no factual evidence or actual science to support any of it. Big reason why some of these arguments wind up happening that eat up pages. Cycle back a few pages to get an idea of what I mean.
I don't see anything wrong with points 2 and 3. If you look at modern agricultural practices, there are many problems. For example, plants require many nutrients to grow optimally. Most modern fertilizers use 3 minerals exclusively, which results in produce with significantly lower micronutrient density. The lack of crop rotation, large amounts of herbicides/pesticides/insecticides/fungicides used, and various other issues don't help either. Soils are becoming increasingly poor in minerals, which makes its way to the consumer. As a result, supplementation is warranted sometimes, but the only way to know for sure is via blood testing to see your levels of various nutrients.
A similar story exists for animal products. Unless you are eating pasture raised, grass-fed meats, eggs, milk, and other animal products, they are not as rich in nutrients as they should be. Omega 3 fatty acids, CLA, various minerals, and other factors are significantly higher in pasture raised animal products. This has been confirmed by scientific research and I urge you to look into the effects of these decreases in nutrients.
There is also the issue that the FDA and other testing institutions don't scrutinize the supplement industry for falsifying information on their labels. The lack of quality control, no verification on product identity, purity, etc. are not being identified by consumers. People buy supplements and don't know if they are getting what they paid for. There are brands out there that use stringent third party testing and are high quality. A tell-tale sign is that stores like GNC don't sell them and you have to get them from health care practitioners. These products are never marked down because the cost to produce them is higher, but again, the quality is guaranteed. Cheap supplements can actually be quite bad, from oxidized polyunsaturated fats to heavy metals and more.
I disagree with the last point. The stabilization and isometric contraction required by the erector spinae during various deadlifts is very beneficial for lower back strength. Also, I use straight leg deadlifting (locked knee position) for prehab and mobility development. Yes there is inherent danger, as there is in many other beneficial movement patterns. But if approached from a progressive and not too aggressive protocol, it can yield great results and prepare your low back for
real world situations. This movement has been practiced in olympic weightlifting and gymnastic circles for decades and is oftentimes known as the Jefferson Curl.