This was a very, very poorly written response. I don't see how this helps their case at all.
"After being caught up in an incident that occurred at half time" - what does this mean? They are confirming he was involved in something. Just say it. Say why he was being questioned. And then they confirm later in the letter that there was a violent incident that occurred (though they do claim that Fire fans "attacked them twice now" - even though this apparently happened near their section?)
"Foreign ownership aside, in this country people are innocent until proven guilty...." - This line here accomplishes nothing but being antagonistic. Its stupid.
Interesting that in the section where they mention soccer fans are so kumbaya all with each other ("pregame together" - please use different language, go to weddings together, etc.) they left out fight together. Also, I'm sure Knicks or Yankees fans don't do those similar things he listed. Agree its a different culture and the bond is different, but he does nothing here to point that out.
And of course, agree with everyone's comments above. Something did happen, they have as much confirmed that in this letter (stupid). Come out and say what happened and why the ban on Juan should be lifted.
Sorry for the rant. The 6 train was all messed up this morning and I'm a little bit Hangry.