Honestly, no. There is plenty of available evidence but since you asked I will shed some light.
You claimed that piracetam will have no significant positive effects on people with a generally healthy mental state(Btw mental state =/= mental order or disorder). This is not the case and has been documented as such for decades.
They do not. Drug receptor and enzyme targets, their affinity for those targets, mechanisms of action, half life, metabolic processes and byproducts, and excretions are different for every drug. There is also the important placebo factor to be considered.
Then by your logic I can assume you have some anxiety, depression, and/or other mental issues?
If this is the case then I am quite perplexed, as piracetam has done all of these things for me in the past and to my knowledge I have no current mental issues.
Sorry, but your theory - "The effectiveness of Piracetam really depends upon your mental state IMO. If you have relatively "happy" life, I don't think piracetam will do much. If you have constant problems with anxiety, inability to concentrate and general depression, piracetam can be a godsend. " is bunk.