Why should they? Roads are not there only for those actually using them... Okay, but a big part of the opposition to raising necessary taxes to maintain infras

Why should they? Roads are not there only for those actually using them... Okay, but a big part of the opposition to raising necessary taxes to maintain infrastructure is the notion: "I already pay for that." So pointing out that no, you don't already pay for that, you're being subsidized in this case, becomes really important. In any case, I'd argue that pushing more of the costs of roads onto the immediate road-users would internalize now-externalized costs, produce better incentives, and ultimately more efficient use of resources of many kinds.