They gathered together against Moses and Aaron, and said to them, “You take too much upon yourselves, for all the congregation is holy, every one of them, and the Lord is among them. Why then do you exalt yourselves above the assembly of the Lord?” Numbers 16:3

You may not be as familiar with this scripture as you are others.
Korah was a cousin to Moses and part of the workers of the tabernacle but Korah wanted more. He wanted the authority of Moses. He wanted to lead the people.
Not everyone can or should lead.
From the scripture, it is clear he declares that everyone is as holy as Moses and Aaron.
The mumbling and grumbling of the people prove they are not as holy as Korah says.
This rebellion against God’s anointed is proof Korah is not as holy as he thinks he is.

Years later a young man is anointed as king. The reigning king makes several attempts to kill him but makes a mistake that puts him in harm’s way. David had an opportunity to kill King Saul but would say, “The Lord forbid that I should do this thing to my master, the Lord’s anointed, to stretch out my hand against him, seeing he is the anointed of the Lord.” 1 Sam 24:6
Saul was truly the Lord’s anointed and not for David to decide his removal. God took care of it Himself.

Use caution when speaking against a leader, even though he/she may not be a good example of leadership.
Pray and ask God to change your heart and if He sees fit, God will change the leader.

In the case of the rebellion of Korah, Dathan, and Abiram – they died and all that joined them and all they had.
As the pronouncement of the judgment, Moses and Aaron (the leaders) fell on their faces, and said, “O God, the God of the spirits of all flesh, shall one man sin, and You be angry with all the congregation?” Numbers 16:22
Now that’s a leader – someone that intercedes for doing wrong.