I appreciate your gentle tone, but I do not think Calvinism is dismissive of any Scripture. I know that as a Calvinist, I am open to any persuasion of Scripture, provided I am not asked to ignore other Scriptures bearing on the same topic. And I have yet to hear anyone provide proof that God will fail to accomplish all that he plans to do, including his plan to have mercy on whom he will have mercy.
Some verses have already been mentioned, and I'm heading out the door and have no time, but another is 2Pet3:9:
...He is patient with you, not wanting anyone to perish, but everyone to come to repentence.
Calvists have to either ignore that verse or else go through some extreme mental gymnastics to explain it away. However, it is in perfect harmony with the non-Calvist view, as well as the rest of Scripture, which teaches that God offers redemption to all through Jesus, and that most won't accept it. In addition to those who reject Christ outright, many will acknowledge Jesus as their Savior but aren't willing to serve Him as their Lord, i.e., they treat Him as sort of a spiritual genie in a bottle who is there to bail them out when things are tough.
And yet, that is exactly what calvinists do just to maintain their fairy tale.