If one of those people feels like desecrating the Bible then it’s just a form of personal expression.

If the planned Danish law is anything like the German ones (age-old, introduced after the 30years war) then that’s absolutely fine. You can even do it publicly on SatanCon. Ritual blasphemy is just as much a protected religious expression as religious reverence, meaning that Christians aren’t even allowed to revile you for it in a manner suitable to disturb the public peace.

Where things get iffy is doing it in front of a Church just to piss them off. Rule of thumb: If you’re protesting a religious institution, keep religion out of it. E.g. back in the 60s people were protesting against the Churches’ backwards sexual morals by kissing in front of churches. Much more effective than burning the Malleus Maleficarum. That’s more suitable for an inquisitor to do in private to cleanse themselves.