On the contrary, it would be a massive benefit to Trump to close those tax loopholes. Many of the interests in the US government that oppose him do so by laundering massive amounts of money through "non-profit" organizations ala Koch and Soros. If he guts those loopholes it makes it exponentially more expensive for them to lobby against him.
Also don't make the mistake of confusing Trump with "Republicans". Traditional Republicans like the Bush crowd and their backers, Rupert Murdoch, and other high powered donors (according to both a congressman that's a family friend and reliable news sources) absolutely despise Trump. I'm also told that there's a very real fear that he might actually prosecute Wall Street executives since(unlike Obama and Bush) he isn't dependent on them for funding.
As far as Bernie...well, I'll just say that I greatly respect his sincerity(which Trump lacks) and his anti war on terror activism. In practice his policies are going to be an even greater disaster than Trump.
One datapoint relevant to the talking points on his website:
Also remember that I used to work for the federal government. I can attest first hand that his solution to problems, just throwing massive amounts of money at the problem, does all of jack shit. The money just dissapears into a black hole and nobody can figure out what happened in every single instance I observe....sometimes to the tune of hundreds of millions of dollars.
Let's just use education. Measured over time, the academic achievement of American public school students has a negative R-factor with spending per student.
The thing is that no small part of America and Europe's economic woes are caused by the sovereign debt crisis. Sanders is likely to exacerbate that problem resulting ultimately in large scale civil unrest. Trump's "let's run government more efficiently" platform....leaves an enormous amount to be desired but will take us a lot longer to get there.
In a perfect world. Trump would get elected and last just long enough to make good on his promise to replace all the corrupt and inept bureaucrats with good managers......then be impeached and replaced with a competent, experienced, moderate conservative (like Kasich).
PS: I'm actually in Paris for the next few days.