Golden Girl

The same reason that we don't just have 2 TFs in the game, or only 2 story arcs.

The new zone will move some of the current stories towards a conclusion.

All of that's missing the point - it's the deciding if it'd be a good idea or not to surrender to Tyrant and his loyalists thugs that could take longer than 3 seconds - although not for anyone who's actually been to Praetoria or seen the invasion plans

I'm not so sure - I mean, on the Sutter TF, the War Walkers say they'll give us 3 seconds to surrender beore they wipe us out, so Tyrant's totally holding back and trying to be as reasonable as possible when dealing with the superpowered people of Primal Earth - like he didn't only offer a ridiculous 1 second, or even a tight 2 seconds - he generously gave us a full 3 seconds to weigh up the pros and cons of becoming his prisoners

Like style, class, sophistication and fashion-sense?

You don't always lose - but you do if you get involved in any big world-threatening events - Heroes will always save the world, and Villains will never conquer it - which means that Tyrant and the loyalists will never win, so any player that sided with them would be an automatic loser.
Villains have to have low-level successes - they can't have any major success that would affect the game world.

Tyrant can mass-murder and brain-wash and torture and oppress people in Praetoria, and villains can help him - but his bigger plans to spread mass-murder, brain-washing, torture and oppression to the wider game world will fail, because the good side can't lose - Tyrant's role, just like any other supervillain, is to be a failure anytime he tries to do anything that will affect the wider game world.

Yes - which is why I never treated it seriously

One off images or pages are ok for humor, but I'd never put something like that into an actual comic - I like to obey the lore

I never trust Villains that far

But that means they'd be failures and losers - Tyrant and his loyalists have to be defeated for us to make the Well switch its support - so anyone who sided with Tyrant would be an automatic failure, as Tyrant is destined to lose, so the story can move onto the next stage.

Or ever will have - it's just not as popular to be naughty as it is to be nice

Well, that's understandable - it'd be dumb to mess with Lanaru's lover.

Why? Tha last new single-faction zone was red side

Or maybe make them all Praetorian-style moral choice stories? Like there'd be a choice in each arc where you could decide to be good or evil.

Actually, irrational only counts when it goes against the lore of whatever universe the couple are in - if one or both of the shipped couple already have a lore-confirmed loved/Husband/wife, then it's irrational to pair them off with someone else - but if neither of the shipped couple have a lore-confirmed lover/husband/wife, then they can't be properly irrational.
For example, Obidala is irrational, but Bobahutt is isn't.

Because the people planning on enslaving the world you want to destroy also intend to remove you from the pciture.

Aa crazed fanatic who enslaves his own daughter, and a sadistic thug - just two of the "good" people that "responsibility" loyalists help to carry out their evil work.

I think it's totally ok - the Rikti and Tyrant would both wipe out Heroes and Villains if they won - both invasions are a fight for survival for everyone on Primal Earth - and it doesn't matter if your goal in life is to protect the world or conquer it - these forces coming from other dimensions are trying to make sure that first, the world you want to protect/conquer will belong to them, and second, that you're not around to protect/conquer it.

Dark Watcher isn't female, as far as I know

I think Anti-Matter just wants the war to stop, not for Tyrant to actually be removed from power, as all the Praetors would go down with the dictatorship too.

That makes you get rid of a cup of coffee?

I'm sure he and Anti-Matter could generate plenty of sparks together.