Consider, for example, that while you could put the thing down, it might:
start crying uncontrollably, or
run off into the woods (hello, Mr. Bear!), or
start eating the trash, or, ...
Oh, so you are unvaccinated, don't wear clothes for warmth, have survived the plague and only eat what you've killed yourself?
A true self-sufficient specimen of survival?
I would also add that if your child managed to eat trash, started crying and ran off into the woods within the 20s that it might take to put things into a rubbish bin, then you shouldn't be too worried because it seems to have the survival skills to live in the forest and outrun the meanest predators.
The good news is that after a few years, these safety puzzles become those mathematics problems where the minivan can carry 7 and drives at an average of 40 mph, Suzy can bike to soccer practice at 12mph but only before sunset, Mike's mom is driving south on the freeway at 70 mph and if you drive north on the back roads at 40 mph, the question is which exit should you choose to meet her at so that the crock pot does not overcook dinner before you turn around?
I mean there are lots of other situations that occur regularly which require you to put a child you're carrying somewhere else. I mean how do you think parents of more than one child manage?