God’s not mean or controlling. He is God, & I think that people want very readily to accept that He is Love, but they don’t like the aspects of His being Holy & Just. That aspect of His Being turns them away to see exactly how holy & just He really is.
If He were “trigger happy”, you’d have no say, & any action taken as unholy & unjust would immediately result in death. I take the Scripture’s words here:
2 Peter 3
9 The Lord is not slow in keeping his promise, as some understand slowness. Instead he is patient with you, not wanting anyone to perish, but everyone to come to repentance.
He is patient dealing with His creation that seems to be in constant rebellion with Him. The Israelites at that point in Bible history saw God in action. They witnessed the plagues in Egypt. They witnessed the angel in the pillar of fire stopping the Egyptians from attacking them. They witnessed the sea opening up as it did to allow them to cross from the land of bondage into freedom.
They entered into a covenant with God. You can read about it here in Exodus 24:
It is important to understand what a covenant relationship is because short of the New Covenant under which Christ followers are we have nothing in our modern times to equate. When I was in RCIA, the covenant was understood as a familial relationship. The parties entering into it swore to keep the conditions/laws/rules, etc. of the covenant.
Some links on covenants:
http://www.scborromeo.org/papers/covenant.pdf
From the Catholic Convert Website on Covenant:
"God forms his people Israel
CCC 62 After the patriarchs, God formed Israel as his people by freeing them from slavery in Egypt. He established with them the covenant of Mount Sinai and, through Moses, gave them his law so that they would recognize him and serve him as the one living and true God, the provident Father and just judge, and so that they would look for the promised Savior (Cf. Dei Verbum 3).
CCC 63 Israel is the priestly people of God, “called by the name of the LORD,” and “the first to hear the word of God” (Dt 28:10; Roman Missal, Good Friday, General Intercession VI; see also Ex 19:6), the people of “elder brethren” in the faith of Abraham.
CCC 64 Through the prophets, God forms his people in the hope of salvation, in the expectation of a new and everlasting Covenant intended for all, to be written on their hearts (Cf. Is 2:2 4; Jer 31:31 34; Heb 10:16). The prophets proclaim a radical redemption of the People of God, purification from all their infidelities, a salvation which will include all the nations (Cf. Ez 36; Is 49:5 6; 53:11). Above all, the poor and humble of the Lord will bear this hope. Such holy women as Sarah, Rebecca, Rachel, Miriam, Deborah, Hannah, Judith and Esther kept alive the hope of Israel’s salvation. The purest figure among them is Mary (Cf. Zeph 2:3; Lk 1:38)."
Korah’s (& those who’d rebelled along with him) sin was great. He was rebelling against God’s priesthood.