I get your point, and don't disagree with it, but the analogy you used is still off. In the case of fuel taxes, they're mostly used to fund road maintenance. Since the amount of road damage (and therefore maintenance cost) increases exponentially/geometrically with axle weight[1], it doesn't make sense to tax cyclists because the amount of cost they incur is negligible. On the other hand, it does make sense to charge electric vehicles extra $$$, because they incur road wear but don't pay for it via fuel taxes.

[1] https://streets.mn/2016/07/07/chart-of-the-day-vehicle-weigh...