I hope I'm not coming across hypocritically. My contention is that the lines are drawn that simply. It's not that Captain Marvel takes up with Batman, or Green Arrow with Superman, Injustice draws a line between super-powered and supra-powered, which is fine for the occasional dust-up, but when the premise is with an evil Superman, who'll "do whatever it takes", supported by the rest of the super-powered League. . .it's hard to swallow that. . .for five years. Give them the Spear of Destiny or something.
And, BTW, how're you doing?
Actually, they do go over it. Year 3 is when they tackle it head-on. They also have something akin to Velocity 9/Bane Juice in the form of a pill that normal people take to fight against Superman and crew.