Agreed.  For those souls that become assimilated to God, they become part of God's fire, and become assimilated into it.  Those who do not become likened to God are burned by it.

God is a perfectly simple being.  When we speak about God being merciful to some and just to others, forgiving some and "punishing" others, it's not God who changes or is "different" depending on the individual.  It's the individual who is different, and for one individual God brings incredible joy, but to another this same God causes intense suffering (for those who resist being consumed by the fire).

We human beings with our puny intellects try to look at God from different perspectives, or consider one aspect or God at one time, and another at another, but God in Himself is not subject to these types of considerations.  He is, and He is love.  This same love that brings unspeakable joy to those who accept it causes suffering for those who don't want it.

I looked at some short videos on what fire is. Seems it's mostly about molecules being ripped apart and others joined together.

Perhaps hell is like fire because those souls who are against God's will are constantly 'ripped apart' due to going against His love (and will). While those in heaven do not suffer because they go along with God's love (and will). While purgatory the 'bad' stuff gets ripped off until your desire for creatures is completely removed and you are fully submitted to God's will (and love). Pic related

St. John Bosco had a vision of Hell.

Interesting.  Basically, it's something beyond our comprehension and "earthly fire" is a symbol that comes closest to describing what actually takes place there.  There are lots of things that are beyond our comprehension, and so they're explained to us in terms we can understand.  When we read descriptions of God's Mercy and God's Wrath, it's not as though God is Merciful sometimes or to some people and then Wrathful at other times and to other people.  He is perfectly simple, always the same, never changing ... and so these differences are from the perspective of how the individual souls relate to God.

Yeah, it's similar to how figurative language is used i.e God got angry. Since God does not change. So this language is used to give us understanding.

(As a side note I really hate arguing with dishonest anti-christs who don't care or ignore this when you explain it to them)

So perhaps since you will have a physical body in hell you will get to feel the fire of God's love physically?

but if someone resists it and blocks it out, it causes unspeakable torment.

Our Lady showed us a great sea of fire which seemed to be under the earth. Plunged in this fire were demons and souls in human form, like transparent burning embers, all blackened, or burnished bronze, floating about in the conflagration, now raised into the air by the flames which issued from within themselves together with great clouds of smoke, now falling back on every side like sparks in a huge fire, without weight or equilibrium, and amid shrieks and groans of pain and despair, which horrified us and made us tremble with fear.