These unfortunate incidents are not anyone’s fault but if the liability legally falls on you, there is nothing you can do to avoid the consequences. When faced with the loss of future earnings, medical bills, and legal settlements, that $250,000 policy is not going to be nearly enough.
Umbrella insurance can provide millions worth of protection with a monthly cost that isn’t any more expensive than a nice meal out. If you have potentially expensive risk exposures, you can’t afford to NOT have umbrella insurance.