Short of the low life in the back streets of towns and cities, no one intends the dog in their care to bite anyone, yet, it happens on a regular basis according to the news, which only reports the serious attacks, and frighteningly they are all to many. It doesn't need to be a pit bull, a nip from a chihuahua could land the owner/carer in deep water these days. You said yourself you wore thick gloves to handle the dog because it could be aggressive.
As for under your control at all times, no one can guarantee that, accidental escapes happen.
I can't decide if you are sat at home making up stories about gardening and dogs etc to deliberately get a rise out of forum members, for entertainment purposes/because you're a fantasist,
or whether you are totally unhinged and its all actually happening, in which case the people who entrust their property and pets with you must be equally bonkers.