I mean, if it sounds cruel to you if it dies, then feeding a goldfish to your fish is just as cruel. If theres a problem with the oscar, I WILL remove it. Being irresponsible would mean I would allow for a fish to be killed. Im trying to take my fish OFF feeders. You suggested I use a schooling fish rather than an oscar, if I do that, that would be irresponsible, because that fish would probably be 100% dead since its defenseless.
Also, if you had read my other posts, you would have seen my concern that the Oscar may be a problem to my other fish. So dont say I am being irresponsible. Mixing fish is a risk no matter what. If you have a problem with this style of fish keeping, then you need to complain to about 90% of the forum people who mix fish where there is risk that something MAY be killed/eaten.