If Universalism is true, you can’t choose to be damned. On the contrary, you are saved, sooner or later, no matter what you ever do. So, you are not free. No matter what you do, or fail to do, you shall be saved. So, it can’t really matter to you, what you do, or how horrible the consequences of what you do. How could it, since you are not free?
Sin on then, right? Knock yourself out! What’s the problem with that?
On Christian orthodoxy, you are free to choose – and, to bear the consequences. So, there is a moral order to things, that cannot be gainsayed. In that case, your choices matter. In no other way might they be available for you to make in the first place.
Which shall it be? Are you free, or not?
Go for it.
Bearing in mind, of course, that, on universalism, *you cannot go for it.* On the contrary: on universalism, your choices are moot; are not, in the end, choices at all; for, you are not free – including the choice of whether to be a universalist.