I want to address carelessness from an experienced point of view. I have been careless the majority of my life. From as far back as I can remember, most things I needed to get done were brushed to the side unless I got some kind of enjoyment out of them. I've been a careless son, a careless brother, a careless boyfriend, a careless father, a careless friend, a careless grandson, nephew, employee, careless driver, writer, drinker, smoker, and just about anything else you can see under the sun.
Truth be told, you cannot force yourself to care about anything. You can't just wake up in the morning and say, "Hey! Maybe I'll start caring about things today." Unfortunately no one can do that. But you can, in fact, start forcing yourself to do the right things and when you see the outcome, (which is going to obviously be good) you will start to genuinely care about everything in life!
Carelessness comes in all shapes and sizes. The statement may come up, "if you REALLY cared about me, you wouldn't have done that." Well yes and no. Yes because its true... you couldn't find a reason to respect that person enough to do the right thing. No because you can care about someone and not care about yourself. So you do what you want and selfishly disregard every care in the world.
Some people just don't care about the same things as others which also throws difficult situations your way. Better to care about something than nothing at all and better to care about everything than just a couple things. Reason being, the more careful you are about things, the better they will turn out. The more carefully you add ingredients to your cake batter, the better the cake will taste. The more carefully you change the oil on your car, the less likely you will be to have stupid mistakes occur like forgetting to replace the oil plug. It goes the same with just about everything.
-victor hugo-