Typical Ultras' whataboutism to distract from the fact that they intentionally broke the rules, forced the club in bad financial times to receive a fine and are refusing to pay it.
I hear that very same topic in German football from nearly every professional club for over a decade now. The Ultras are the same, everywhere.
They think they have more rights than other fans because of their support and secondly, they don't understand that traditionalism and success can't go hand in hand anymore in today's time. You want to be successful? You need to sell yourself to the broad public or to a suggar oil daddy. But you can't demand traditional values and winning titles anymore, it's delusional.
But again, their letter is a big distraction from the very fact, that they're mad the club forces them to pay the fine.