The question is not whether God is just, or whether as Creator He is different than His creatures. The question is why He created them, and what is His ultimate intention for them.
The doctrine of ultimat unversal reconciliation, as I see it, does not teach that everyone will enter heavenly bliss upon dying, whether by suicide or whatever. My belief is that everyone will receive what is needed to restore there souls, and whther they face the fire of His presence(Rev 14:10) to be disciplined for wickedness or not, His purpose for Hs creatures is ultimately to restore them to sanity and love.
19 For the anxious longing of the creation waits eagerly for the revealing of the sons of God. 20 For the creation was subjected to futility, not willingly, but because of Him who subjected it, in hope 21 that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. 22 For we know that the whole creation groans and suffers the pains of childbirth together until now. Romans 8
The futility has a terminus. The glorious liberty of the sons of God does not. It will eventually consume all creation.
“Evry knee shall bow, whether in heaven or on earth or under the earth, and every tongue confess that Jesus Christ is Lord to the glory of God the Father” Phil 2
5 For he must reign until he has put all his enemies under his feet. 26 The last enemy to be destroyed is death. 27 For “God has put all things in subjection under his feet.” But when it says, “all things are put in subjection,” it is plain that he is excepted who put all things in subjection under him. 28 When all things are subjected to him, then the Son himself will also be subjected to him who put all things in subjection under him, **that God may be all in all.
I do not disagree that there will be recompense to the wcked. I see that in the scriptures, but every adversary will be subjected eventually, and reconciled. God will become all in all.
“For from Him and through Him and to Him are all things, to whom be the glory forever.” Rom 11
"For so it pleased the Father to make all fulness dwell in Him and thru Him to reconcile all things to Himself by the blood of Hos cross, whether things in heaven or things in earth. Col 1
“In all wisdom and insight 9 He made known to us the mystery of His will, according to His kind intention which He purposed in Him 10 with a view to an administration suitable to the fullness of the times, that is, the summing up of all things in Christ, things in the heavens and things on the earth.” Eph 1
His ultimate intention is kindness. His ultimate purpose is the restoration of all creation through Jesus Christ…
“…whom the heavens must receive until the period of the restoration of all things spoken of by all the prophets since ancient times” Acts 3
“Behold, I am making all things new! Write down these words for they are faithful and true.” Rev 21:5
“If I am lifted up from the earth I will draw all men unto me” John 12:32