If two carers were required to take this man out we can assume his needs went beyond requiring help to go to the toilet? As evidenced by the fact he attempted to kill a child.
Given the attack on the child, we can guess that two carers were needed because of known behaviour towards other people.
But in general you can't assume needing two carers means danger to the public, because there are many people with disabilities who need 2 to 1 because of personal care or toileting, because they don't or can't "go to the toilet".
When you have a full size adult who uses continence aids (you may know them better as nappies), it may take two carers to help them safely, simply to keep the person safe from rolling off the bed and falling on the floor.
Or it may be possible to support the person with their hygiene safely with one carer at home in a known environment with all optimal prescription equipment to hand, but need two carers to do so out in the community.
I can think of one person who uses incontinence pads but who can access the toilet at home with one carer, depending on the skill of the carer and the strength of communication with the carer, because of the specialised equipment at home. However out in the community, you'd need two carers, and a fully equipped Changing Places accessible toilet with adult size changing bench.