I Have a Question

Why do a lot of companies tolerate lazy, pain in the butt employees who won't half do the job and call out all the time, but then blame good employees for slight mistakes and often fire them for the first mistake that comes along? Dad always told me it's baffling how crappy companies treat good employees but then treat the good for nothing employees like gold. And no this doesn't always happen. Bad employees do get the ax, but I've seen a lot of what I'm talking abt and so have others.