You seem to misunderstand something, I don't recall us ever saying his intention was for them to die, but if this was a US legal case, he would be charged with involuntary manslaughter; the keyword here is negligence, we said he lied and gave them a false sense of their own strength.
This was especially important when the group wanted to go to the instant death floor, yet even here he didn't think it was important to inform them of their possible easy deaths.
I don't know if you are bestowing some novel knowledge on us, but in the anime nothing indicates that he wanted to "push" them, he saved them because he happened to be around for whatever reason, he joined up with them for an undisclosed reason which was probably loneliness.
If he wanted to "push" them, he could've done so while telling his level; that way there would be no misunderstanding about the groups own strength, they would've probably not even brought up going to the instant kill floor, and this is how he caused their deaths.
Intentional or not, he was the cause of their deaths, which is hilarious cause it means him saving them initially was entirely pointless.
Oh and about your ass-grab about 95% of all players, in all online/mmo games I 've played, ranging from PSO till Dragon's Dogma, I've always encountered players that massively helped me out without any pretext.
I guess I'm lucky to meet that 5% of players for 11 years in a row right?