50/50 chance to win

When the story is told about the Japanese man that bet on black and it is said the Japanese man had a 50/50 chance. Roulette tables have a 0 and sometimes a 0 and double 0 which gives the house an advantage. The house always has the odds in their favor, there is never a 50/50 chance

Since 1950 all but two mass shootings happened in gun free zones, notice a pattern?