do more harm than good

do more harm than good

to be damaging rather than helpful Giving children too much freedom often does more harm than good.
Usage notes: usually said about things that are intended to be helpful but do not have a good result
See also: good, harm, more
References in periodicals archive ?
In fact, experts said rat traps with poisoned bait do more harm than good.
What you eat and drink before a race can do more harm than good unless you make sure that all the food and drink consumed is completely digested.