And how far would that be? It was demonstrated earlier in the issue that Supes could fly halfway to the sun and still be under Max's control. As soon as Max wakes up, the thing starts again.
The most effective nonlethal solutions I've heard people present involved lobotomy or a chemically-induced coma. Beyond the fact that both of these options are unwieldly, risky, and incredibly time-consuming considering that all Max would need is a moment of clarity to stop them, but morally far more reprehensible than killing him.