So you insist on a conservative from birth who has never shifted or changed positions (everything you cite there is from at least 15 years ago)? I know for a fact I personally couldn't pass that test, I'm changing all the time. I suspect most others couldn't pass that test either.
No, I insist on a trustworthy conservative who has actions to match his rhetoric, not someone who has a history of positioning himself whichever way the wind blows for his own popularity. And many of these positions are not from 15 years ago. His liberal position on immigration was just from 2008. His call for socialized healthcare goes back as recently as the first debate when he called for a single payer system and praised what Canada and Sweden has (ie, he was taking the same position as Bernie Sanders). The same with his call for progressive tax rates.
Trump's history shows he is not someone who can be trusted, he is in it for his own glorification and he'll even sell out his own name for fleeting attention (at that, selling out is the basis for the Trump brand). If the momentum suddenly changed and the money and media suddenly went another direction, his history shows he would jump right in front of that. Look at how he handles the Islamic terrorism issue. Just one year ago he was saying Pam Gellar was being too mean with her Draw Mohammed day, now, right after Paris, he switches and says we aren't being tough enough. He isn't stable on anything.
