Because taxation is theft, taxes are used to fund illegal settlements and wars in over 100 countries. Get informed about your government.
Taxation is theft? And who is going to pay for roads, public transportation, sanitation, legal systems, public safety, education, health care systems, military, scientific research, culture and the arts, public works, distribution, data collection and dissemination, public insurance, basic income etc?
The private companies are going to pay for the roads. Also, this is a very basic, common, first glance "argument" that statists always put forward. It doesn't matter what the taxes go to, if they were acquired by violent means (ie armed robberies), it was theft. Also, majority of your taxes don't go towards health care or education or public transit, but towards forging the military empire.