It’s natural to come up with excuses when you’ve done something wrong or don’t want to do something that is difficult. People like being right and can tend to be lazy, so they fight to rationalize and defend their decisions. As a writer, you need to avoid making excuses so that you can learn from your mistakes and experience a life worth writing about.
If you’ve made an error, you may naturally want to figure out a way to defend your action (or inaction.) It’s easier to believe that it was someone else’s fault, so you’ll try your hardest to find a way to wiggle out of any blame or responsibility. You may even think up a weak excuse that only makes you look even more foolish. Instead of doing this, admit that you were wrong or that you made a mistake. This way, you’ll learn from the experience and avoid making that same mistake again. If you’re constantly making excuses then you’re not thinking about how you can grow and improve.
Writers need to fail. They need to write a lot of terrible screenplays before they can churn out a half-decent one. The only way to get better is to discover how you’ve failed. If you’re defending all of your mistakes then you’re not letting yourself truly fail. If someone gives you a note, you shouldn’t make excuses for why you wrote it that way. Instead, take the note and figure out how to incorporate it into your writing.
Excuses aren’t just for defending your shortcomings. People also use excuses to avoid doing something, especially when that thing is hard to do. If you have excuses to avoid any sort of social interaction, event, or chore then you’ll never do anything. There are always reasons not to do something. If you give in to those excuses then you won’t have any experiences to write about. The worst thing a writer can do is stay at home in front of the computer. Even if your excuse is that you have to write, it can sometimes be better to shirk your writing in favor of getting some life experience.