I have an opinion on the pricing of higher end mountain bikes - I wish they were less expensive. I don't have an opinion on how they (or any bike) are used - bank robbery notwithstanding. You stated that bikes should only be used for transportation.

Suggest reviewing the following links regarding argument construction, how to avoid fallacies, etc.

https://www.oxford-royale.com/articles/construct-compelling-... https://en.wikipedia.org/wiki/List_of_fallacies