Double taxation is clearly both legal and constitutional. Ever looked at the Greenmail tax?
There's a bizarre Constitutional rule about direct taxes vs. indirect taxes, but if it was "apportioned among the states according to population", a federal wealth tax would in fact be clearly constitutional. If not it would require an amendment.
Most likely the wealth tax would be dropped in favor of an income tax with the income tax rate being dependent on wealth -- this would be found constitutional under the Income Tax Amendment.
I was not aware of 26 US Code 5881, but searching around I can't find that it has ever been challenged in court, which is where the question of whether it was illegal or not would be settled. I did find a Villinova Law Review article from 1990 criticizing it as an improper application of tax law. I only scanned the article, but it might not stand up to the legal challenge.
What happened were the greenmailers changed strategy to other things rather than fight the tax. Apparently it's also fairly easy to avoid the tax because the definitions of the conditions is very narrow.
A wealth tax would affect all the richest people in the country and the top tier tax attorneys int he country would be taking it all the way to SCOTUS. Throwing $50 mil at a court challenge is chump change to avoid paying that much in tax every year for the rest of your life.
I think there are better ways to break the capital these people are holding loose that won't be fought as vigorously or at all. Change the tax code to make the tax rate on investments that actually create jobs in the US very low and those that don't are taxed as regular income. These people would be so desperate to get the lowest tax rate they will be doing all sorts of schemes to create jobs with their capital. Some will not pan out, but their capital will end up mostly in workers pockets for a while.
In your view, given the circumstances, what is the best possible outcome with regards to the current tension with Iran? Also, assuming Iran was in fact not involved in the tanker attacks, as the Iranian government has claimed, what do you think the strategy is behind the US claims that Iran is culpable for the attacks?
Different players have different motives. For Trump, everything Obama did was terrible, so if Obama succeeded at anything, he has to tear it down. That's why he wants to kill the ACA. Iran was Obama's best foreign policy achievement, so Trump has to do the opposite.
Bolton is a New American Century idiot. Most of them crawled back under a rock after the Iraq war, but Bolton is too stupid to shut up and he's continued his agenda. The Project for a New American Century (PNAC) was a 90s think tank run by Cheney, Rumsfeld, and some other people who ended up in the GW Bush administration. They argued that because the US was the last superpower, the US should do what it wants and invade who it wants on the world stage. The Iraq War discredited them, but Bolton is a true believer.
Some other in the administration think a war with Iran would be a hail Mary to save the 2020 election for Trump. They are realists about how badly Trump's prospects look for 2020. But the US has never voluntarily switched presidents during a war and pushing the Afghanistan war back into the headlines is not a great idea so they are ramping up Iran instead. They think that if Trump gets into a war with Iran that it will boost Trump's re-election chances, but Trump doesn't think it's a good idea because he doesn't know how to direct a war. He's an abject failure at running a business. A war will also take headline space away from Trump, which he can't stand.
Finally there are US allies chomping at the bit to take out Iran. Saudi Arabia is the center of Sunni Islam and Iran is the center of Shiite Islam. The two hate each other and it goes back to when Mohammad died. There was a major split in how to replace him and the two schools of thought formed. They've been hostile ever since.
Iran has also been a regional antagonist to both Saudi Arabia and Israel.
And then there is oil. Taking a major supplier offline and increasing the threat to other suppliers will jack the price of oil and help Saudi Arabia's bottom line. As
@neroden wrote a couple of weeks ago, the Saudis are desperate for cash and need oil prices to go up. A number of Republican backers would make out like bandits if the price of oil went up too.