I think it depends on what your definition of cruelty is. Some states have laws that they have to be killed if found, no trap and release.
If shooting them with a paintball gun gets them away from you and your garbage and doesn't harm them, this is far better than 1) killing them or 2) having them around with the diseases they can carry (rabies).
Personally, I wouldn't have used a paintball gun to shoot it...
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White Sox Fans, knowing more about baseball and the cubs than their own fans since 1901.
I have no other choices. And if you think its cruel to shoot a raccoon one time, you clean up trash all over your front yard. Cans or not, they get in my trash once a month. Most times one shot hit or miss moves them from my trash.