In all honesty, what he wrote on facebook was mean as fuck. Regardless of how he felt about her politics, someone uninvolved was killed by that madman. Besides that, he's wishing that someone who's had a threat to her life go through it again. The guy must be a moral cretin.
Whether it was fair or not for a company to sack a person based on their views outside of work is another matter. Frankly, I'm glad he lost his job. Bit of karmic justice (yes. a dark souls reference).