Ok, let’s take your position for a moment.
So you will make these gerim who do not know what the mitzvos are, and have no intention of doing them. They become gerim, and don’t do any mitzvos. They die, and go to Hell. (I really can’t imagine any defense of tinok shenishba for someone who willingly accepts judaism, he at least knows and accepted to find out.)
Now, who is barbaric? Me or you?