From the warped perspective of the Nazis at the end of the war I don't think the Natter was a totally stupid idea and made more sense tactically as a point interceptor than the Me 163 had. The 163 needed a valuable and extensively trained pilot to fly and land the thing and had to operate from a fixed base that could be attacked or avoided. It was just as dangerous to that pilot as the Natter would have been, not just from that plane's fuel volatility but from Allied fighters as it glided back to base.
The Natter was essentially a manned SAM that could be cheaply built from mostly non-strategic materials using unskilled (i.e. slave) labour and fired from anywhere. It just needed someone with enough training to point it at a bomber, press a button to release its load of rockets or shells and bail out. If the pilot got killed by Allied fighters while in his chute then there were plenty more Hitler Youth to take his place. Not an option for any sane government sure, but the Nazis...why not?
If they had managed to sort out the bugs then the Natter would have probably also worked better than the other un-manned SAM systems being developed by the Nazis at the end of the war because unlike modern SAMs none of those included a viable proximity fuse and so would have needed a direct hit.
