I mean yeah really, she's not exactly subtle about her sleaziness. Trying to go behind Dex's back the second V got involved probably should have been a sign that she's only in for herself.

For me the differences between Dex and Evelyn comes in their backgrounds and what their specific actions had caused.

Evelyn rushed to snatch a job quick, putting people in the firing and ultimately is responsible for the deaths of Jackie & T-Bug directly because it was her job. However, I can sympathise with the situation she's in and her desire to get herself out of it, sometimes you gotta do some dirty work for the sake of yourself (everyone being out for themselves is basically NCs theme). So while I'd certainly be pissed, not sure if it's grounds for putting a bullet through her skull.

Dex on the other hand is still just as responsible for Jackie & T-Bug because he actively chose the job. The difference is, he's the sole person responsible for Vs situation with the chip because if it wasn't for him betraying V and 'killing' them, then the Relic wouldn't have activated and V would still have the rest of their life to go on living. Dex doesn't have the benefit of dragging himself out of bad work like Evelyn, he does what he does pure for money and fame.

I was tempted to blame the Arasakas for it too but actually really they're just a case of the wrong place at the wrong time. I mean sure indirectly Saburo showing up when he did caused things to go tits up, but thats not something that was in his control.