I think thought experiments like this are not persuasive:
"There are 100 quadrillion aliens, and their suffering decreases by some small amount each time they conduct a sexual assault... Each alien rapes 100 trillion humans per second. The first 50 trillion eliminate their agony (each rape only very slightly diminishes their suffering) and the next 50 trillion makes it so that their mental states are as pleasant as being burned alive is unpleasant."
Is this something people are capable of imagining?
I think it would be rhetorically better if you instead said something like, "Consider an arbitrarily large number of people who are raped," since the precise numbers in your case are unimportant and it requires less cognitive work for your audience to keep the idea in place.
I think thought experiments like this are not persuasive:
"There are 100 quadrillion aliens, and their suffering decreases by some small amount each time they conduct a sexual assault... Each alien rapes 100 trillion humans per second. The first 50 trillion eliminate their agony (each rape only very slightly diminishes their suffering) and the next 50 trillion makes it so that their mental states are as pleasant as being burned alive is unpleasant."
Is this something people are capable of imagining?
Provided they are not conceptually impoverished.
I think it would be rhetorically better if you instead said something like, "Consider an arbitrarily large number of people who are raped," since the precise numbers in your case are unimportant and it requires less cognitive work for your audience to keep the idea in place.