everyone has the right to make that decision for themselves, whatever the reasons! full disclosure: I DID wear one for about a year, and then decided I didn't really need it. I have not felt unsafe or uneasy without one since.
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"Think of bicycles as rideable art that can just about save the world". ~Grant Petersen
Cyclists fare best when they recognize that there are times when acting vehicularly is not the best practice, and are flexible enough to do what is necessary as the situation warrants.--Me