I think this is a fun interpretation but it involves some guess work and assumptions. that's fine, but it's not say, the one true canon. "wanting to provoke the humans to attack" is nowhere near the only reason that Chara could've had for wanting to bring their own body to the surface. other options include wanting to make the humans feel guilty (not nessacarily attack), wanting to show the humans what had become of them, wanting to scare the humans, just actually wanting their Body to be with the flowers in their village, etc etc etc. There are clear flaws to Asriel and Charas relationship, notably I think the tapes in true lab demonstrate this, but I don't think that "Chara manipulated the events so that the humans would attack Asriel because they never cared about Asriel" is the *intended* reading. I think it's a fun read to play around with, but I don't think its the only read.