It should also be noted that this illusion is not specific to any economic system. The soviet union also saw its share of jaded idealists who were gullible to the point of believing that all those promises of owning the means of production had any credibility.
At least in capitalist economies workers are educated with regards to liberal ideas. Thus they are informed that a work relation is just like any business relation, and therefore they are compelled to look after their own best interests without falling for the "company loyalty" emotional trap. Your employer owes you the salary and you should expect nothing more in return, and consequently you as a worker are compelled to always look after more favourable arrangements just like your employer is perpetually doing wrt your job.