In some ways no, since the government provides us the right atmosphere of conducting business and living in peace, Taxation is very important.
And aren't we able to provide the same without the interferences of governments? We are, and also we could do it far more efficiently if we had 100% competitive market (no subsidy, no tariffs, no import quotas, and so on). Gov is only required for the defence of national borders and enforcement of contracts between parties. Thus for these minimum level of government activity only a minimum level of taxation should exist, whatever above that level should be considered equivalent to theft.