I know the meaning of "almost", as I'm sure Mr Biden does. But if those law changes are "almost" sinful, there must be a point where it actually becomes sinful, in which case Mr Biden should be able to show us where in his holy book it is stated as such. But of course, he won't and he can't. But I'll wait patiently.
As to the meaning of sinful, surely it is rooted in religion. Sin, sinner, sinful.
If Biden just meant bad or terrible, he could have chosen those words instead of the religiously loaded "sinful".