And
why is it the current trend in automotive (specifically, truck) fashion?
This is a weird indirection to introduce: of course it’s fashionable. The observation is that it’s fashionable because aggression is itself fashionable, at least to the target market.
I used Jalopnik as a source, since they’re a well known car website. I’ll try to find additional sources; I seem to recall an interview with a Ford or Chrysler exec a handful of years ago where they said, point blank, that aggressive front designs are a key selling point to their customer base.