The financial penalty is not “one year of support”. The attacker is obligated to pay the difference in value between a kesubah of a besulah and a kesuba of a beula. This is appropriate because he caused her “marriageable value” to decrease by that amount.
The actual punishment is that if her father so chooses, the attacker must marry her and forfeits his right to divorce her. If the father does not exercise this option, seemingly there is nothing further. Obviously, there is dinei shomayim.