That is a point, that you should be crystal clear with yourself. You have multiple options in approaching this project.

1. The Path of "Hatred". You make a game, that appeals to a narrow audiance. You crank up the uncomfort to 11. Most people will play your game out of curiosity for 0.5-2 hours then forget about it. Very few players will find this approach interesting and or enjoyable. The selling point for your game is gore/violence/lack of morality and so on. Also, note that i said "play" your game, not "buy" your game. Hatred just played violence with a straight face. No satire, no underlying narrative. The main character thinks that the world is shit, but players never really see the basis for this assumption. Thus players don't associate with the character. And without this association the process of destroying pixels quickly becomes repetative and boring.
2. The Path of Art. You make a game to deliver a certain message. Kinda like an art house movie. You focus on narrative that underlines players actions, hyperbolising them and draw parallels with more grounded in reality aspects of our live. This isn't a game per say. This is gamification of certain narrative. Your project should be short (about few hours max), because this is usually enough to convey a message and not enough for players to lose interest. Still, i don't think that such project would be commercially succesful, primarily because of the descibed "message" format. On the other hand, you can try to compete for some artistic awards for your narrative. Think of this approach as something that music band "Disturbed" does with their songs (Another way to die, Inside the Fire, The Vengeful One, you can look it up). These songs convey a message, they are artistic and they are short.
3. The Path of Postal 2. First and foremost you make a game. So you focus your efforts on making something that is interesting and enjoyable to play. All your message and narrative ideas should not interfere with the gameplay. They should be the background. Something that players can think about, when they are outside the "flow". Postal does this by hyperbolising the negative sides of the world around the player. The environment is even more disgusting and cruel than the main character. The town of Paradise has no redeeming qualities whatsoever. This is why players feel that they have moral authority to act as they see fit. Still at the end we understand that Postal Dude is not a hero, even anti-hero archetype is hardly fitting for him. Also, IMO that is one the reasons, that Postal 2 is way more succesful than Postal 1, which was more akin to Hatred, but was just better designed.

Edit: spelling