There are also legal aspects to doing layoffs (WARN Act, providing return transportation to home country for employees on certain visas[1], plus state-specific legislation like in California). Unethical companies have gone without doing these things in the past, so accountability is in everyone's interest here.

  [1] 8 USC §1184 (c)(5)(A): In the case of an alien who is provided nonimmigrant status under section 1101(a)(15)(H)(i)(b) or 1101(a)(15)(H)(ii)(b) of this title and who is dismissed from employment by the employer before the end of the period of authorized admission, the employer shall be liable for the reasonable costs of return transportation of the alien abroad.