Remember, this painting was produced in 1928. Also, freon refrigerators were still around the corner, and televisions wouldn't be common in households for another two decades. Indeed, lasers in Paul's images are only used to blow things up - preferably big things, like huge spaceships and even planets.
Violence is excitement, and excitement sells magazines.
Many of Verne's and Wells' classic novels were fantastic voyages. That's excitement without violence.