I don't think it is ever alright to rejoice in or celebrate the death of a person (not talking in the context of celebrating that they are spending eternity in worship and communion with Jesus, free from pain and sorrow and suffering).
God's timing in perfect.
I listen to the news and the theories and all I can think is:
God's got this too. His way, His planing, His timing.
A man may plan his deeds but God directs his steps (loosely paraphrased there.....). Even in the context of free will and choice (I don't understand but I know it's Truth)
This is NOT a surprise to God.
The aftermath is NOT a surprise to God.
He uses even those who stray so far from Him in His Kingdom plan.
We will never understand it this side of heaven (and we may not understand in there either), but God is in control.
And that fills me with peace.
There is evil, there is pain, there is war and death and sorrow.
But there is peace because I rest my security on the Rock Who cannot be shaken.
I will trust in the midst of trouble and chaos that God is directing and planing and using.
Yesterday, today, tomorrow.
There are no surprises in store for God.
And there is great hope and peace in that for me.