I don't think endemic poor software quality is about "lack of perfectionists." It's mostly about perfectly rational cost/benefit analysis. A lot of software is valuable for reasons other than code quality (e.g. network effects). In this case it makes complete sense that businesses would rather be first to market than produce something of the highest technical quality.

There are other issues at play, of course. In cases where quality and business profitability are strongly aligned - think avionics - then there is plenty of high quality software.