ends sometimes justify means. yaakov avinu lies to get eisav’s berachah, yael lures in sisera in order to kill him and save klal yisroel (the source of aveirah lishma), you’re allowed to save someone’s life by breaking shabbos (means) so that they’ll go on and observe more shabbosos (end), at least acc. to one of the gemara’s explanations for pikuach nefesh being docheh shabbos.
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