I would have to know more about the situation. Providing a laundry service is good, but is a mobile service better than putting those resources into a fixed site? And, because this is private charity, how much of a tax deduction is this guy taking? Is he deducting the cost of the vehicle? If he is taking deductions then this activity is being effectively subsidized by taxpayers. That money might be better spent more efficiently on other services.
It's doubtful that this one guy is a registered charity. As a private individual you can't just claim your expenses and actions as a deduction. It's also kind of sad that your first thought when you see someone who decided to do something in his own way help your big concern is he's "inefficiently using tax deductions for his personal project". Maybe you should examine your own contributions?
There is a strong sentiment in the US against paying more taxes in general to level the playing field a bit and help people in need, it's usually labeled as socialism. And now it's not even ok to use the incentives put in place for people who want to give extra money? Registering as a charity is the only way to make donations tax deductible, taking that away would basically reduce the donation and their effectiveness by the average tax rate of people with money to give, and they are usually not in the 12% bracket.
At this point I'm not a fan of higher taxes because the cost of living is going through the roof. If we had good healthcare not attached to employment, a modest cost of living, and effective social programs, I'd be happy to pay more in taxes.