To view the best ending, do not enter the subway or the taxi after leaving 
the gay bar. Destroy the red car and a cinematic will start, with the bartender
explaining everything. Once in the subway, proceed to the train. Use the phone
before entering the train to get an ally to help you fight. Once on the train,
defeat everyone then exit. When you are fighting the two gang leaders, allow 
them to win. After the cinematic, choose the option to go directly to the 
Phylex building. Reach the final floor of the skyscraper. When fighting the 
helicopter, wait until the cannon above the door falls off the wall. 
Take it, load it, then shoot down the helicopter.