I always tell my clients to put all knives out of reach (especially of children). And, if I stage a meal vignette, I use dinnerware but no silver ware. And if someone in the house sews, I suggest putting scissors out of sight/reach. In the same vein, I suggest putting cleaning fluids and wipes out of reach.
Basically, during a showing or an Open House children may go exploring. Try to prevent danger to them. And, sadly, knives and silver ware have been picked up an used as weapons. So, yes, I consider leaving sharp things out an unwarented danger.