?? its wrong to feel better with a helmet on????
It's not about right or wrong, just the level to which you take more risks because you are wearing a helmet.
As an example, you say that the helmet makes you feel more confident. That
could lead you to doing something more risky than you would do if you didn't have confidence (such as going up the inside of stationary traffic) and you
could get yourself into a position (if the traffic started moving) in which you are on the inside of a bus pulling onto a stop or an HGV turning left with consequences that will not be affected by whether or not you are wearing your helmet.
If we accept the assertion that a helmet will do little good if you are doing over 15mph (you can substitute that for 25 or 35 or whatever, the exact number isn't relevant), then your increased confidence could lead you to heading down a trail or down a hill on the road faster than you would ride it without the helmet, at speeds in excess of those at which the helmet is designed to provide benefits.
So, whilst it's not automatically wrong to feel better with the helmet on, if you then compensate or, worse, over-compensate for that
perception of safety, then that could easily lead to you being at greater risk when riding whilst wearing a helmet than you would be without.
see my point about ppe, building sites shouldnt insist on wearing ppe, it shouldnt be law, according to you
This introduces other factors, such as the economics of the employers in paying for the PPE, etc. The government recognises that employers should bear the costs of providing a certain level of PPE, so they enshrine that in statute. However, even PPE isn't 100% about compliance with legislation, there are companies which go far in excess of the legal minimum, but the law is there to raise the lowest standards, not define the highest.