if (%bomb) {
      set %colour 1
      display You have picked the colour Red!
    }
    else did -ra Bomb 1 You have not turned on the bomb yet!
  }
  if ($1 == blue) {
    if (%bomb) {
      set %colour 2
      display You have picked the colour Blue!
    }
    else did -ra Bomb 1 You have not turned on the bomb yet!
  }
  if ($1 == black) {
    if (%bomb) {
      set %colour 3
      display You have picked the colour Black!
    }

Is far easier to read than

if (%bomb) { set %colour 1 | display You have picked the colour Red!  } 
else did -ra Bomb 1 You have not turned on the bomb yet!  }
if ($1 == blue) {  if (%bomb) {       set %colour 2 |  display You have picked the colour Blue!   }
else did -ra Bomb 1 You have not turned on the bomb yet! }
if ($1 == black) {    if (%bomb) {      set %colour 3 | display You have picked the colour Black!  } }  

So it isn't really bracket abuse, it is just for ease of reading. and scripts run faster with brackets -_-