My subwoofer makes a huge difference for me inside the car without being loud enough for you to hear it. They give a nice rounded tone to the music. As with literally everything, don't hate the people that like the sound of subwoofers - hate the people that abuse them.

A single 12 isn't really going to be too audible outside the car unless its being pushed very loud (excess of 600W~).

Most people don't have two alternators, with battery banks to drive multiple 12s or 15s.

There is effectively no point ever where my system has "impacted" others.

I am aware, that’s why I don’t have one in my flat (and I don’t own a car for that matter so none there either) but they’re still a hell of a lot of fun.

Wild, there are also other people around you who might they're more fun too, they might want you to turn it up.

Have you considered that your overly condescending tone is quite ironic given the content of your comment?

Hot tip: the other users you see online are often real, thinking humans just like you who have their own thoughts and emotions and world views.

You should consider how your sarcastic and condescending comments online impact others.