I think with Trump under the threat of being muted, Biden had space to make his positions clear.
Biden was quite good.
Trump however did handle the "Paris Accord' stuff well.
Why should the USA sign up for reductions in industrial activity when China, India and Russia do not stop polluting until 2030?
Trump did get that point across well.
Trump is more feisty, but clearly, Biden is more 'Presidential' in a traditional sense.
I think the race has tightened, but I cannot escape the COVID-19 infection at the point where Trump lost it.
Even if Trump won the debate, it's too little, too late.
"My neighbor is killing children, so why shouldn't I too? Children are going to be killed either way, after all."
(This is almost literally what you're saying, by the way.)
Yup, a rather dumb argument, to be sure.