I didn't say he was liable, those are words you chose. I wouldn't have chosen those words.
In your earlier example of the knife being sold to a known killer who is professing to kill again, the store isn't liable, but they are complicit in the killing.
I say that Cruz's vote for Corker is perhaps one of two things;
A vote cast with ignorance of the effect of his vote, which calls into question his wisdom.
OR
Cruz knew the effect of his vote, which would raise the question of why he cast that vote, as his love of America is without question. I have my own theories, and they align with theories Trump has proposed.
Either way, Cruz is not liable, only complicit.
It's your test, you wrote the questions, and you get to determine which are the correct answers.
However, to the reader of the criteria you've set forth, an answer to why the support for Corker would seem to be an important one in 'the protection of life' section.
Lol. Disingenuous does not begin to describe that nonsense. You said Cruz violated the right to life test by voting to delay the release of Iranian assets. Complete and utter nonsense that only makes sense if the writer of that crap is a nutty liberal. Cheers!