It's the difference between driving people around and being a dedicated getaway driver. You might be a taxi driver all day and that's fine and legal, but if a

It's the difference between driving people around and being a dedicated getaway driver. You might be a taxi driver all day and that's fine and legal, but if a reasonable person would know that they're helping criminals flee a heist, you can't just get away with pleading ignorance. Conspiring to commit a crime is a crime itself.