Mono is the prefix and cracy is the root word
The theme? What they’re trying to portray
It represents the moral and social decay that results from the uninhibited pursuit of wealth, as the rich indulge themselves with regard for nothing but their own pleasure. The valley of ashes also symbolizes the plight of the poor, like George Wilson, who live among the dirty ashes and lose their vitality as a result.
Because they could get hurt and something really bad could happen also !