Whatever

[Victor]

Summary: What do I have to apologize for?

You are acting like an idiot. Let me annotate your message.

you never even asked the AC developers if you could actually make a fork of their game. AssaultCube may be open source, but it's not uncopyrighted.

There is no need to ask them. Their code is licenced under the zLib licence.
What does that mean?
1) "The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required."
Our name does this.

2) "Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software."
Once again, our name does this.

3) "This notice may not be removed or altered from any source distribution."
Yep, added to SVN @ source/Readme.txt

4) "additional clause specific to Cube:
Source versions may not be "relicensed" under a different license
without my explicitly written permission."
Well, that only applys to Cube, so it doesn't apply to AssaultCube. That's why our relicencing to the GPL v3 is okay.

And please don't compare this fork to how Cube and AssaultCube are related. Remember, the developers of Cube actually support AssaultCube, something we cannot say about you.

Cube -> AC
AC -> ACR
They are both mods/forks!
Does it matter if the previous developer supports the fork?

If you maybe complied for a change and (gasp!) apologized, you might get somewhere. I can't guarantee this (I am, again, nothing more than an AC community member,) but damn.

I would immediately apologize, if it were the case that I need to.
*If this isn't obvious enough, "it were" is past subjunctive. It shows counterfactuality.
Also can be stated this way:
Were it the case that I need to apologize, I would immediately do so.