Once again, you are making a false equivalence. You are so determined to put Steve on the level of Scott, it is you who has the bias, not I.
The Phoenix was a KNOWN parasite, one that, in addition to the Jean Grey history, took out Nova and put him in a coma. That is how AvX started, with Nova falling to Earth on death's door.
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And then Steve had Logan confirming the threat...
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No one in their right mind would think the Phoenix was freakin benevolent. No one. It is completely batshit to try and take that stance.
Meanwhile, the cosmic cube, unlike the Phoenix, is neither good nor bad. The maliciousness or good of it's deeds always depended on who was wielding it at the time. Red Skull had used it for evil the in the past, yes, but if you recall Steve used it to restore the memories of Bucky Barnes to the Winter Soldier. The last known wielder of the the shards, including Kobik, was Maria Hill. No one knew that Kobik was sneaking off to meet with Red Skull. And Maria Hill, while driven to the point of manic, misguided and morally gray, is not
evil. Steve had no reason to suspect, at all, that what actually happened would happen.
You're trying to compare an elderly man on death's door wanting to live so he could take out the very present threat of Crossbones (and survival is the top tier of Maslow's Hierarchy of Needs. Survival is a basic instinct) to choosing to try and tame a parasite everyone KNEW was freakin malicious because they all had previous experience with it and very recent examples of it's maliciousness. False equivalence.
Accuse me of rose colored glasses all you want, I'm rubber you're glue and all that, but you've failed to present your argument in any way that convinces me Steve has any culpability in his own victimization. I remain, and always shall remain, dubious to your claim and towards your intent.