Our Gemara on Amud Aleph explains that certain verses are not mentioned in Musaf because they are too harsh, though they express valid ideas of Kingship on Rosh Hashanah:
גְּמָ׳ מַלְכִיּוֹת, כְּגוֹן: ״חַי אָנִי נְאֻם ה׳ [אֱלֹהִים] אִם לֹא בְּיָד חֲזָקָה וּבִזְרוֹעַ נְטוּיָה וּבְחֵמָה שְׁפוּכָה אֶמְלוֹךְ עֲלֵיכֶם״, וְאַף עַל גַּב דְּאָמַר רַב נַחְמָן: כֹּל כִּי הַאי רִיתְחָא לִירְתַּח קוּדְשָׁא בְּרִיךְ הוּא עֲלַן וְלִיפְרוֹקִינַן, כֵּיוָן דִּבְרִיתְחָא אֲמוּר — אַדְכּוֹרֵי רִיתְחָא בְּרֵישׁ שַׁתָּא לָא מַדְכְּרִינַן.
The Gemara cites examples of verses that may not be used in Rosh HaShana prayers because they deal with punishment. With regard to verses of Kingship, for example: “As I live, says the Lord God, surely with a mighty hand, and with an outstretched arm, and with fury poured out, will I be King over you” (Ezekiel 20:33). And although Rav Naḥman said about this verse: With regard to any anger like this, let the Holy One, blessed be He, express that anger upon us and let Him redeem us, if that is the process necessary for redemption, since the verse was said with anger it is not included, as one does not mention anger on Rosh HaShana.
Rav Nachaman’s point that he would rather receive God’s wrath if that is necessary for redemption than God’s apathy reminds of the basic principle that children will misbehave for attention. It is a mistake to oversimplify this, and say, “They are just doing it for attention, so I won’t gratify this behavior.” While that may be true, it is important to actively seek out situations where you can effusively praise good behavior.
Children, especially young children, operate symbolically. If they see a sluggish or depressed parent, intuitively they fear the loss of their existence and even death. A child may accidentally spill a cup of juice, and hear his mother or father yelling and getting all reactive. While the child may not actually want to be yelled at, the liveliness and activity can be reassuring and gratifying, especially if the parent was moping and depressed on the couch a minute ago. Therefore, according to the eminent researcher and psychologist, Alan Kazdin, if you want to change behavior, it is important to target what positive opposite you want to see, notice it and react strongly and effusively. So let’s say it bothers you that your children squabble and fight, or even you see that a child does not play quietly for a few minutes and constantly demands your attention. An example of how to deal with this is to notice when the play is going well, and after a long enough time that this represents positive change, say 2-3 minutes, react effusively with the praise. You can say something like, “I see you are playing quietly by yourself. THAT’s GREAT! I’ll set the timer for another 5 minutes and then I’ll join you or read you a story.”
The basic idea is that your overall emotional wattage and emotional power must consistently be slanted in regard to desired behaviors, and muted in regard to non-desired ones.
Translations Courtesy of Sefaria, except when, sometimes, I disagree with the translation 
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