Of course the government also does many worthwhile things, but your extra money will be spent entirely on worthwhile things, and not at all on horrific ones.
I disagree with (even despise) some of the ways government spends our money, but should I get to choose like some special snowflake while most don't have the same opportunity?
This just enforces a rigged economy... and guess what? Many of the privileged few would support government programs the rest of the so called democracy wouldn't.
Your tacit assumption is that wealthy individuals who can take advantage of bullshit tax favoritism will spend that extra money in worthwhile (subjective) ways.
But in the meantime, I don't think there's anything morally wrong about legally reducing taxes and sending the money to charity instead. I'd even argue that, since privilege is an issue, we should expand this opportunity beyond the privileged few.
As best I can make out, a CRUT reduces your tax burden dramatically if 1) you are young, and 2) you fund the CRUT with equity that has a very low cost basis. I don't think the tax code should contain a special magic wand that reduces tax liability so low for this particular situation, because this advantage seems unfair to people who accrue their wealth over a lifetime by more traditional means.