In Parashat Ki Tavo (28:15-on) Moses threatens the Nation with very descriptive curses. It starts from a distance:
'וּבָאוּ עָלֶיךָ כָּל־הַקְּלָלוֹת הָאֵלֶּה וְהִשִּׂיגוּךָ׃ אָרוּר אַתָּה וכו
One would understand that without G-d's closeness and providence all the bad things will happen all by themselves.
But very quickly it turns personal:
יְשַׁלַּח ה' בְּךָ אֶת־הַמְּאֵרָה
יַדְבֵּק ה' בְּךָ אֶת־הַדָּב��ר
יַדְבֵּק ה' בְּךָ אֶת־הַדָּבֶר
יִתֵּן ה' אֶת־מְטַר אַרְצְךָ אָבָק
יַכְּכָה ה' בִּשְׁחִין, etc
G-d Himself will orchestrate and carry out all the curses "עַד הִשָּׁמְדָךְ" until He will exterminate us totally.
In the Story of Exodus, it is stressed that G-d Himself came down to Egypt and performed the Exodus, He and not [even] an angel.
Why in the curses it is important that G-d Himself will curry them out personally and that will not happen "naturally"?
