Your examples of Torah-handling would all be signs of obvious disrespect for the venerated object. They would therefore be properly reproved. No one argues that members of a particular religious community ought to be subjected to the scandal of witnessing, in their own sanctuary, open disrespect for their beliefs and traditions.
But that is not what happens when a non-Catholic receives communion in a Catholic church. The recipient not only intends no disrespect but looks and acts like everyone else present--at least in my limited experience. If not--if the recipient behaves inappropriately--then it becomes analogous to mishandling a Torah and some kind of intervention is justified.
The scandal arises, in the Catholic case, not from how the recipient acts but from who the recipient is. Of course, most of the time there is no scandal at all, because few if any people are even aware that a particular communion recipient is not a Catholic, and those who know, usually his/her relatives, either don't care or feel favorably toward the action.
So it is the person's identity and spiritual status, not his attitude or behavior, that the church feels difficulty with. The problem, for me, is that there really is no determinable dividing line here. Catholic/non-Catholic is a very artificial and uncertain distinction. Catholic churches are full of communion-going Catholics who very consciously do not accept or practice various church doctrines or disciplines, contraception and abortion being the most obvious. Why--apart from mere ethnic, familial and cultural labels--should such people be viewed as across the line into the Communion Zone, while, say, an evangelical Protestant who fully agrees with the Roman church about most essentials plus contraception and abortion, is not?
Or "fallen-away" Catholics? I personally know of instances of people (one in my family) who haven't believed or practiced the religion for years, but who on appropriate occasions take communion simply to keep peace in the family.
Even apart from such doctrinal and affiliational issues, why is it that the church doesn't (as it actually once did, at times and in places) make a visible effort to screen mortal sinners from communion? Surely they receive as "unworthily" as the baptized and perhaps very devout and morally upright members of a different denomination would. If the church is so zealous to protect The Body & Blood of Our Lord Jesus Christ® from profanation, surely even Catholic communicants ought to be checked out for some level of compliance with Catholic moral norms.
And, in fact, that was once done . . . but it broke down very quickly where it was tried because it proved totally impracticable. For many reasons, but not least that the favor of the most powerful in the land was indispensable to Holy Mother Church, and they lived as they damn well pleased. So the church got very, very used to the scandal of men with mistresses practically falling from their pockets as they approached the communion rail. Indeed, you might say that's part of Catholic tradition. Certainly, the Protestants said it.
So if the Catholic church can't really protect the Eucharist from being profaned by former Catholics, doubtful Catholics, Catholics with mental reservations, and just plain sinnin-an-lovin-it Catholics, why should it worry so much about the occasional non-Catholics who approaches the altar rail, either in ignorance, or in the belief that his faith and good intentions (and maybe his relationship to the deceased, or whatever) override the Catholic church's party line?
Because that's what's really at issue here: not the sacrament, but keeping denominational boundaries sharp. The Catholic church wants to maintain its brand, and making an occasional stink about who is and is not invited into the Real Presence® is one way to do it. If Quinn had never written about her little jaunt no one would have said squat, no matter how many recognized her. It was only when she thrust the issue out in public than wind machines like Donohue got cranked up, and a few prelates had to wag their heads gravely to appease the Morlocks.
Somehow, I think the Jesus of Emmaus wouldn't have been too concerned about whether the others were carrying their membership cards.