Evilbible goes on to say that the only objection to their last point was that humans must have freewill to be happy. For one, that's not the only objection, as I have already shown, but for the sake of argument let's continue. They say this is a weak argument.
The first point is that God just as easily could have created robots that would be happy without freewill. In fact, that way the creation would have stayed perfect. This argument is weak because God finds delight in our everyday lives, including seeking after him because of trouble we are going through. If there are perfect robots, they have no reason to seek Him whatsoever.
Their second point is that God could have created freewill, but merely to choose between several good options. The example they use for this is the angels who haven't sinned. This shows a lack of knowledge of the Bible because Satan and the demons were originally angels who attempted to reach the same level as God. Angels CAN sin, but they lack a sin nature which is the reason that humans mess up so much. We will ultimately be elevated above the angels because of the faith we need to follow God in spite of that, and without a sin nature and free will such faith would be meaningless.