Rabbi Yehudah ben Betheira flips the entire debate on its head with a single devastating observation. The other rabbis have been arguing that chametz must be burned — and only burned — before Passover. They think they are being strict. Rabbi Yehudah ben Betheira tells them they are actually being lenient, and dangerously so.
His reasoning is brilliantly practical. If you tell someone that chametz can only be destroyed by fire, what happens when he cannot find fire? He sits with his chametz and does nothing. The strict ruling — burn it and only burn it — paradoxically becomes a loophole. A person without access to flames has an excuse to keep his leaven right through the deadline.
So Rabbi Yehudah ben Betheira proposes a two-stage framework. Before the Torah-mandated deadline arrives — meaning during the early hours of the fourteenth of Nisan, up through the sixth hour — the preferred method of eliminating chametz is indeed burning. Fire is the ideal. But once that deadline passes and the prohibition takes full effect, the obligation shifts: eliminate the chametz by any means available. Crumble it, scatter it to the wind, throw it into the sea. Whatever works.
The genius of this position is that it honors the ideal while preventing the ideal from becoming the enemy of compliance. Strictness that leads to failure is not strictness at all — it is negligence dressed in piety.