I'll answer this question with a question, how could a loving God condemn people who have rejected him and his love to be forced to spend all of eternity in his presence?
I think you mean "force" not "condemn". Sorry, but it just doesn't sound right to even consider being "forced" to remain in His presence as condemning.
I would say most who have rejected Him haven't truly experienced Him. I find it almost unbelievable, if not entirely unbelievable, that any who truly experience Him would reject Him.
But, at the risk of offending because of the lower comparison to worldly things: A man makes a really big wrong choice. It earns him a life sentence without parole. That life sentence puts him in prison--permanently separated from the world he did wrong in and from the judge who would sentence him. He earned it. The judge has every legal right and even the responsiblity to "honor his choice" and put him away for life. But, does that prisoner really want to be separated from the world and judge he offended or did he just make bad decisions that landed him in the prison for life?
There is a difference from being told what will happen if we do something wrong and actually experiencing it. I am told not to touch a hot stove, but as soon as I touch it, and get burned, I don't touch it again.
So, the question you asked isn't the opposite.
Truth is, we all deserve HELL, so that any of us can choose to believe and have the Judge declare us innocent, despite our wrong doings, is too wonderful for words to truly express. While God presents the choice and warns of the consequences ahead of time, He is not loving those who choose to disbelieve His testimony and thus "call Him a liar". He is not loving those who "blaspheme the Holy Spirit" and cannot be forgiven in this age or the age to come. He is not loving those who get the "mark of the beast". He is not loving those He "turns over to a strong delusion so they might be damned" or those turned over to a "reprobate mind". He is not loving those who are "sons of perdition". My point is that God doesn't unconditionally love, and He doesn't have to, if He is God.
Why would God want those who rejected His testimony, His Son, and His Holy Spirit to be found in all eternity with Him, anyway? Why would believers who had to suffer at the hands of those who rejected God want to have to deal with the same issues that the earth deals with, because God didn't keep His Word and keep all those who practiced unrighteousness out of heaven?