I teach my students that perception is as much an issue as intent when it comes down to the review of your self defense shooting. If you are perceived to have been looking for a fight before (or after) the occurrence, then it plays into the Police, DA, Grand Jury, Jury and Judges view of you. That applies to these 'Shoot them all, let God sort them out', 'Anyone found here at night will be found here in the morning', signs, stickers, etc. Comments on Social Media, in public forums (like here), and even just in conversations at parties or in public can and WILL be used against you by a vindictive anti-gun Prosecutor or the shoo-tee's Defense Attorney in court. It is not only your comments or display of perceived aggression, but by what and how you act when you carry. Many firearms and accessory companies don't do us favors by putting out products that promote a negative view of our intent. Ammo names like 'Zombie Max', DRT (Dead right There), etc may be great for marketing to young wanna-be's, but will be looked at in a negative light when a Grand Jury reviews your use of them during a self-defense shooting. Even those grips or holster with a skull and crossbones for your 1911 can shed a negative light on your mindset and intent. I see a lot of Marvel's 'The Punisher's'/Seal Team Six's skull logo on gun cases, grips etc these days, and that is negative IMO.
Bottom line, be humble with your reason for carrying, even leaning toward a meek and timid persona. When it comes down to brass tacks, you will more likely be seen the victim than the guy/gal who was a vigilante wanna-be just looking to go out and find trouble.