Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

it makes me feel more secure. It doesn't make me more careless on the road

I'd be astonished if both of these things were true, they verge on the oxymoronic.

I don't know any statistics, haven't read any reports etc.

To have chosen to wear a helmet at all, especially given your professed distaste for what you see as the costs

It makes me look stupid, makes me hot in the summer and it makes my hair as flat as a pancake

you must have read some kind of report which persuaded you that the benefits outweighed these costs. What you read might not have been a good quality report, by scientific standards, but you've actually written a report too

Last night he was riding back home, took a sharp turn, damp cold road, he lost control and ended up on the ground hitting his head on the corner of the curb. I have seen this helmet today, looks pretty badly damaged, in fact I'm sure if it would be his bare head, he would have his temple in pieces.

so even if you only read your own post, you've read a report.