I work in video games, if I didn’t I would have no pool of candidates to choose from.

However if you read what I wrote:

1) Current attitude is not necessarily prior attitude

2) A histrionic tirade is not indicative of an outwardly perceptible attitude, in fact, its more common that these kinds of outburts are from a person who is not outwardly bitter enough day-to-day and is forced to be positive. (thus it boils inside them and becomes venomous)

3) Bitterness is usually the combination of a (often still) motivated person who feels let down. Your companies most negative voices are very often the ones who are passionate but sad about things. Its the “checked-outs” who you really don’t want if you’re building something you want to be good.

It's very unlikely that people just start by being bitter against an industry, but extremely likely that an industry gave people reason to become bitter in time. People tend to start their careers fresh and free of preconceptions, while industries keep carrying their "blemishes" through decades and many generations of people.

You're applying the circular reasoning of "of course I treat you like crap because you have a bad attitude (because I treat you like crap)", while ignoring the part in the bracket.

I hunted down someone who was known for their bitter critique of the industry I was in at the time (because I could tell the critique came from the frustrations of someone who was very technically skilled), convinced them to join my team and they've been one of my best hires to date.

This individual was a great contributor and long outlasted my tenure at the company (so it's not just my bias), only to eventually move on to even better roles.

Frankly, if you work in tech and haven't been bitter about some nonsense in this field, I suspect you must not be particularly engaged or passionate about the area you work in.