Why would you not legally avoid what you don't have to pay?
Evasion is illegal, but avoidance is prudent.
Evasion is prudent, why pay for vanity projects and MP's lavish 2nd homes. #based
Seriously though, there is a case to be made that avoidance can be more unethical than evasion, legality is arbitrary and not really here nor there as far as ethics are concerned.