Hi,
There's actually some reasoning behind these decisions - I'm not saying it is good reasoning but it is there;
This is mainly to do with the perception that rodents are eating garbage and therefore could be harbouring more diseasees and toxins. Far from entirely accurate - especially given the size of fish near sewage outlets and the occasional mercury spike/ red tide.
There is actually some fairly good reasons not to eat human produced products ( cannibalism being a somewhat more extreme version) and it is simply this;
Any disease or other problem contained in the product is 100% certain to be able to infect humans. Not that many diseases/ parasites can cross the species barrier.
And to the OP - get a grip. Wasted food is just something that is going to happen - next time just freeze it and keep it in a tupperware box in the freezer and try to convert them to F/T with it later. That would also cut down the price you pay for the rodents.
dr del