I feel like you're trying to pick a fight here. I frankly could give f*&k all if the govt levied a .00001 tax on inquiries to my company, since it get a few dozen a year my only problem would be figuring out how to pay less than a cent. I'm also not sure that anyone has ever complained that inquiries to my company cause any external impact to anyone else in the world, nor is it likely that anyone ever will. I also do dozens of trade cancellations a day. The level of cancellation tax proposed would add up to a couple dollars a year for both of us at most, just to put that in perspective.
As I indicated, I feel HFT is not in the best interest of anyone but the HF traders and to the detriment of the rest of us. I acknowledge that others might not share that belief and that there are good arguments on either side. If I believe HFT is damaging, however, than it is rational to also believe in measures that disincentivize the behavior that I believe is damaging. That's what the government does here in the U.S., from market manipulation laws to laws the prohibit pyramid schemes to any of thousands of other laws that "intrude" on someone in order to prevent them from taking advantage of the rest of our society. You could disincentivize HFT by passing a law banning HFT, which I think is draconian and unnecessary. You could also craft tax law to discourage behavior that damages the majority of our society and encourages behavior that helps it, something that we do in thousands of instances in the U.S. In this case I'm also against that because I think it's too hard to do correctly.
This is how the world works, it's not some but "us against the man" fight. It's rational thinking about what works best for us as a society and coming to consensus to implement it. It's government intervention when market forces have shown themselves inadequate in protecting parts of the population from predatory behavior. As I said, smart well meaning people can disagree if HFT is predatory behavior. However you seem to be disagreeing that there is any role for the government in preventing predatory behavior of any kind. That's a much broader argument, not one I have time for today.