Define utopia in a way that all poeople would agree.
Websters defines it as such:
1 : an imaginary and indefinitely remote place
2 often capitalized : a place of ideal perfection esp. in laws, government, and social conditions
3 : an impractical scheme for social improvement
In other words, one man's utopia is another man's nightmare. Simply because you can never get all men to agree on what utopia is.