If 'However, if people can readily withdraw money from tax-preferred accounts for purposes other than retirement, there is no assurance that tax incentives would ultimately enhance individuals' retirement security.' is true, does it logically mean that 'If people can't readily withdraw money from tax-preferred accounts for purposes other than retirement, there is no assurance that tax incentives would improve retirement security.' also is?
However, if people can readily withdraw money from tax-preferred accounts for purposes other than retirement, there is no assurance that tax incentives would ultimately enhance individuals' retirement security.###If people can't readily withdraw money from tax-preferred accounts for purposes other than retirement, there is no assurance that tax incentives would improve retirement security.