That's part of it. Suspension design also affects wear-and-tear, as does heavy braking or acceleration. And the average number of passengers in a vehicle is probably a bigger factor than anything else in vehicle weight, which doesn't get included into these costs.
Okay, so the "unfair" commentary is a little bit of flame-bait. But I'm astonished at the level of scorn I've seen on EV drivers in public forums. Many EV drivers have already spent far more than other drivers trying to help the environment, paying more for their vehicles (and thus higher sales tax), installing charging stations/solar panels, etc. And some people are fiercely opposed to the $7500 federal tax refunds on ideological grounds. I live in a state where politicians seemingly want us EV drivers not just to pay our fair share for road use, the proposed legislation would have had us pay considerably higher taxes than for other, similar vehicles.