There's a very weird but common misconception that people on disability benefits are somehow a "drain on the economy." But 100% of that money will be spent, on things like rent, mortgage, insurance, food, clothing, and so on. That's money that immediately goes to business owners and, if those business owners aren't hoarding wealth, will cycle through the rest of the economy.
Drains on the economy are where money stops moving, like, for example, when it reaches wealthy billionaires.