But I think you can see that too. If you assume his ideas are correct:

1. His letter becomes well received, my employer changes their hiring policies

2. The current gender ratio was propped by non-gender-neutral hiring practices, without them, that will change back in-line to the base rate

3. My job is in danger

Is anxiety over losing one's job justified?

Or, another line:

1. His letter is well received, but my employer doesn't change their hiring policies

2. My co-workers now think that I have my job not because I earned it but because of the non-gender-neutral hiring practices

3. My job is in danger

I can produce more, but at the end of the day they all threaten either status or jobs, so I don't fault why people would defend their interests with all their effort.