@ageha @vriska @mametsuko @lanodan well - it is a risc assessment everbody has to take on its own. In germany, on very poor infrastructure, I wear way more helmet than I even bother thinking about in NL - the risk for a bad accident is just way higher.
But I hate that talk of "irresponsible" - it is meant to take the joy from bike riding, create fear, sell more fuel and cars. The overall benefit for health is far bigger than the additional injury risk.