That’s how it is in the USA, an employer can fire an employee for any number of reasons that don’t involve a crime.

An employee does not get any guarantee of employment. Getting convicted of a sex crime will definitely get someone fired, but an employer can fire someone simply for being counterproductive. Though most government jobs do require a number of official complaints first.

For contract work common in entertainment there are legal obligations. An employer can break a contract at will, but it may end up in court if not settled privately.