Driving a car is dangerous, too.
The difference is that you're offering a certain service (and food) to people. Regardless, this doesn't even matter.
You seem to be basing your beliefs on a rather strict interpretation of the Fourth Amendment.
While you seem to be basing yours off an interpretation of the fourth amendment that renders it useless. There is nothing the government could not justify with your bullshit logic.
Personally, I think the word "unreasonable" shouldn't even be there, as it allows people like the fools who try to justify DUI checkpoints to twist the constitution's intentions to meet their authoritarian needs. That was a mistake on the part of the founders, though I suspect they couldn't predict every situation where tyrants would try to eliminate freedom.
Were it up to me, there would be a constitutional amendment that eliminated much of the government's powers and set things right, only allowing very explicitly defined exceptions, making it necessary to amend it in the future if it is required. I do think DUI checkpoints are absolutely unconstitutional, but people will abuse that "unreasonable" word to justify anything, as you yourself have proven.