Your second point is an interesting discussion. You are correct that in its infancy, psychology was criticized for claiming to be a scientific field and not living up to that assertion by performing quality research. I believe that this question has been put to rest as the rigors of publishing in psychology require randomized, double-blind, placebo controlled trials.
And they'll try to use the "LoA" as a way to get more 'things' which really just satisfies ones ego and comes from a place of lack. They use it as a tool, as a means to an end. But it's not a tool, it's more of a "this is how it works" and being consciously aware of how it works can be pretty powerful, just not *necessarily* in the way many would think (red lamborghinis and such).
It’s difficult to imagine that thoughts and feelings can have an effect on the world around us. Fortunately, advances in technology and science allow us to visibly and immediately experience the effects of our thoughts. Just like watching an apple fall through the air, there are experiments that demonstrate the immediate effects of thoughts and feelings.
The main principles of the Law of Attraction can also be discovered in the teachings of many civilizations and religious groups. An example, in the Proverbs 23:7, it reads ‘As a man thinketh in his heart so is he’. Proof of praise for the Laws of Attraction can be uncovered throughout the ages; all recorded and taught in different ways, but still there for all of humanity to find.