The key word is "voluntarily" This makes it charity. By lobbying the government to redistribute the wealth, the current crop of Catholic bishops has endorsed theft, not charity.
You may not have seen the gun at your head, or the handcuffs on your wrists as you handed in your income tax forms and wrote out that check, but they were there if needed.
Did Jesus ever say "use guns to raise funds for the poor"?
Did Jesus perhaps have "handcuff and jail cell" sessions? Anyone catch that ~ I've gone through the Bible many times and must have missed it.