Only because Russian designers are morons. If you actually wanted a usable vehicle along these lines then i'd start with a mobility scooter and add a half inch of armour, enough that it's bullet proof. Then add a small turret on top with your choice of weapon.
Then in urban combat the only thing capable of dealing with it is an anti tank weapon; which have minimum arming distances for their warheads to avoid taking out people that fire them too close. Something which would be quite unfortunate if you ran into one in a building; since you couldn't damage it with gunfire and an anti tank missile worth more than the thing wouldn't explode if it hit it.