I think it is a good mindset to have. We must all assume that software is an imperfect thing done by imperfect beings. Even celebrate it.
On this particular case, I recommend concentrating not on the fact that there was a bug, but on the fact that the code written so many years ago is still relevant for someone today. Focus on that. Try to make something that someone will find a bug in 30 years from now.
-- "We Make Shitty Software... With Bugs!"
http://scripting.com/davenet/1995/09/03/wemakeshittysoftware...
I think it is a good mindset to have. We must all assume that software is an imperfect thing done by imperfect beings. Even celebrate it.
On this particular case, I recommend concentrating not on the fact that there was a bug, but on the fact that the code written so many years ago is still relevant for someone today. Focus on that. Try to make something that someone will find a bug in 30 years from now.