They steal from you, so it might not be such a crime to steal from them. By not paying taxes they steal money from everyone. Just divide what they stole by the number of people living in the US and you get the figure they stole from you.
Now, do you still feel that this is not important?
Stealing from individuals is one thing. Stealing from large corporations is kinda different. That is why people evade taxes. The government is a huge operation. Common morality works this way.