...nor that the person who made the mistake should at least be suspended pending investigations
This ground worker probably didn't kill the FA deliberately and is probably feeling devastated at the thought of being responsible.
Something to think about - I'll bet this person is the only one on the ramp who you could trust not to make the same mistake again.
Suspension for deliberate actions, yes - like idiot pilots drinking before flight - but I think this is a little harsh, unless it's for the benefit of the person involved.