Problem is for a long time the heaviest trekkies, the really visible ones, were usually not about the idealism at all.

For every quiet idealist who dreams of a better future there's a loud closet fascist who only sees the uniforms, a rigid militarized society with clear chains of authority, a Vulcan philosophy where cold logic overrides empathy, and where the advanced humans swashbuckle about the universe showing the natives their place.

It's getting better now but back in the day Trek fandom was rough and it's taking a lot to shake the image.