In my opinion most employers THINK at the end they will have to pay, even the inspectors of the employment secretary say you better pay, but in many cases as an employer you win. If you want to get rid of an employee without paying liquidation and start keeping a log of his absences, late arrivals or other infractions of the code of conduct in the company, even if always reported to the secretaria de trabajo you will probably loose, while the judge will favour the employee...besides the employer will have to pay a lawyer, while the employee will have one that works on a commission of the money he gets for you.
BUT if an employee wants to leave and starts sabotaging operations and you file and report it correctly and have your witnesses, you will probably win the case, without paying liquidation.
Besides, hopefully the government will now finally do something about this archaic system of employee protection, which makes the employment market very inefficient and doesnt motivate the workforce AND with the social system in place is not necessary anymore. It's redundant to have / be paying for the social system in place (even if not completely adequate) and still have to pay liquidation.