They can, but those opinions ought to carry very little weight with regards to policy or other people's opinions.

I don't follow. If someone is being condescending to you, your opinion doesn't carry weight?

You don't have to understand any of the OP's post to have a reasonable opinion on this topic - corporations should pay their fair share of taxes.

Sorry, I was unclear. I didn't mean the opinions should carry little weight because someone is being condescending; I meant they should carry little weight if the holder doesn't understand the fundamentals that MrPowers described.

It's a bit like having a strongly-held opinion on garbage collection without knowing the definition of "mark-and-sweep" or "generational GC" (or, perhaps more significantly, lacking knowledge of the concept of memory leaks and use-after-free).

Tax law is very messy and detail-heavy, and absolutely full of tradeoff-based choices. It's very rare that a clear moral best-approach presents itself if one knows how we got where we are today.