People get emboldened because unless you really go nuts, there are no consequences for your actions. People know which liberties they can take and it pisses others off and the cycles turns into madness
Traveling at 80km/hr is monotonous, but also an extremely dangerous thing we do every day and has been trivialized in our mind, but still engages our flight or flight adrenaline response simultaneously.
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Also highly recommend his Shop Class as Soulcraft.