> Do you feel responsible for all negative consequences caused by your tax dollars?
I've got other political enemies as well. If by "negative consequences of my tax dollars", you mean "things our governments spend money on that I disagree with"...no, I don't feel wholly responsible for them, since I fight the proponents of those things, too.
I don't see how being a political enemy implies that an individual would boycott a corporation. If my "enemy" is offering me a deal that is beneficial to me, then I make that deal.
I would say "intent" of law, rather than what actually happens. e.g., the reason we call tax loopholes, "loopholes", is because the consensus is that they're being used to defeat the intent of law.
Megacorp with a shell company of zero employees in Ireland using the double irish[1] I think means the company isn't paying their "fair share".
Fairness is defined by law? Interesting idea. By "fair share" I mean, unsurprisingly, a share that is fair. Corporations are subject to taxation. A corporation that makes healthy profits, in part driven by publicly funded infrastructure, should be required to give back to maintain said infrastructure.
Typically corps accused of avoiding tax earn no profits after their myriad coats are applied, that's how they avoid taxes. While governments could probably do more to charge corps tax, this is a complex grey area and there is no simple way to define fair or collect taxes as accounting rules are so complex. If you tax revenue you penalise new companies, if you tax profit it is easy for corps to find costs or transfer funds to shield profits.
They play lots of shell games to hide the profits, yes, and it is complex. I'm more talking more about the big picture than specifics because, as you point out, this is an involved topic which involves a great deal of money. A lot of effort has gone into creating arguments to justify the idea that workers should have to pay all costs of public infrastructure.
In New York, we can opt pay a flat yearly "Use tax" for an unlimited number items purchased over the Internet from outside of NYS that cost less than $1,000 each. For me, it's about $100, and yes I pay it.
Items purchased online in NYS are subject to sales tax at the time of the transaction, and the burden is on the vendor to collect it.