kaparah without korbanos

R' Chaim Elazari in his sefer Darkei Chaim (p 172) quotes the Mabi"T who asks how it is that we achieve kaparah when the Torah says that an aveira b'shogeg requires a korban for kaparah.  The pashtus is that we have a concept of u'nishalma parim sifaseinu.  Hashem allows studying the parsha of the korban to serve as a substitute for actually offering the korban. R' Yonah in Shaarei Teshuvah (4:8) writes

   כִּי מִקְרָא פָּרָשַׁת הַקָּרְבָּן יִהְיֶה לָנוּ בִּמְקוֹם הַקְרָבַת הַקָּרְבָּן בֵּין שֶׁנִּקְרָא בִּכְתָב בֵּין שֶׁנִּקְרָא בְּעַל פֶּה. כְּמוֹ שֶׁאָמְרוּ רַבּוֹתֵינוּ זִכְרוֹנָם לִבְרָכָה כָּל הָעוֹסֵק בְּפָרָשַׁת עוֹלָה כְּאִלּוּ הִקְרִיב עוֹלָה. בְּפָרָשַׁת חַטָּאת כְּאִלּוּ הִקְרִיב חַטָּאת. בְּפָרָשַׁת אָשָׁם כְּאִלּוּ הִקְרִיב אָשָׁם.)

Mabi"T gives a different answer.  When does sin need a korban for kaparah?  Only when there is a Beit haMikdash standing when you do the aveira.  Ignoring the hashra'as haShechina compounds the wrongdoing and therefore makes kaparah impossible without a korban.  However, when there is no Mikdash, when the hashra'as haShechina is not manifest for all to see, one's sin is less weighty, and hence the bar to achieve kaparah is lower.