Janitors and programmers may be parts of the same machine, but the programmers are expensive cogs which have to be lubricated with money to keep them working (some cogs, obviously, are smaller and need less oil.)

Janitors, on the other hand, and other employees who contribute little to the bottom line of a company, are treated like caster wheels. Annoying when they're not working properly, but trivial to replace, and mostly not worth caring about.