Sayaka's relationship with Kurumi is absolutely toxic yuri, but it's she's the least toxic out of everyone else in the world. God, everyone else Kurumi meets wants to kill her, experiment on her, or rape her. Sayaka just wants to make her breakfast and watch her smile at everyday stuff.
I feel like the point of "everyone hates us because of Regis propaganda" has some truth to it, but is absolutely not the whole truth. To paraphrase what sssr said above, Kurumi's basically Jason Bourne on crack. People's hatred towards her feels too genuine to just be propaganda. She's done some shit.
Also, that line of "You won't feel like dying everytime you sleep" line hurt. Partially for personal reasons, partially because you know at least one of them has felt that way. Sayaka from loneliness and knowing what she has to do, possibly Kurumi from guilt and/or trauma.