If it is so moral what they are doing, why don't they make the whole thing public by themselves. Its not like Universities need to hide anything (sorry for that paraphrase), they are public figures.
The thing is that we as a society have decided that we impose taxes in order to fund common things like protection, infrastructure etc. If now certain members of this society decide they do not want to pay their share anymore, they can say that publicly and we can all decide whether it is for the public good or not (and in the latter case, they can decide whether they want to leave the society in consequence). But what they are currently doing now is hiding that they do not contribute their share to our common good anymore and yes, that is amoral. Its acceptable (and anyones right) to have an opinion (about taxes) but I can expect you to be honest about it.
The thing is that we as a society have decided that we impose taxes in order to fund common things like protection, infrastructure etc. If now certain members of this society decide they do not want to pay their share anymore, they can say that publicly and we can all decide whether it is for the public good or not (and in the latter case, they can decide whether they want to leave the society in consequence). But what they are currently doing now is hiding that they do not contribute their share to our common good anymore and yes, that is amoral. Its acceptable (and anyones right) to have an opinion (about taxes) but I can expect you to be honest about it.