1) The Catholic Church has unique issues due to its hierarchical, authoritarian structure that other Christian bodies simply do not have.
My Church is just as hierarchical and 'authoritarian' (we had a Pope before the Romans or anyone else had one), and yet we don't have sex abuse crises. There was a case a few years ago of a monk in one of the monasteries in Egypt, may God have mercy on him, who apparently slept with female pilgrims in his dwelling, and upon being discovered he was laicized, banished from the monastery, and not allowed to join any of the neighboring communities for fear that he would spread his corruption there as well. After the more recent horrific murder of HG Bishop Epiphanius, may God receive Him, the monk under suspicion was handed over to the police, confessed, and is now awaiting some kind of sentencing (I'm not sure what stage they're at, honestly, because I'm not really aware of the intricacies of the Egyptian legal system). HH Pope Tawadros in response ordered all monastics off of social media, and himself left all social media platforms, and the Holy Synod suspended the intake of any new novice monks anywhere in the world for a full year, while the Church works to cleanse the rot from the affected monastic communities and contain this evil.
None of this changes what has already happened, but a lot depends on how those in authority respond. While it is possible that we may never know every detail of what appears to have been a plot to murder HG Bishop Epiphanius (what with another monk attempting suicide in the wake of the murder; the entire thing is extremely bizarre and hints at something very dark going on at the holy monastery of St. Macarius, where this all happened), but the authorities have been granted the necessary access to the scene and the people involved in order to do their jobs, and the Church is taking serious stock of what is going on, and enforcing some sensible controls in light of the details we do know about what has happened. I think this is the least we can expect to see happen, as laypeople. I would rather not hear absolutely everything, out of respect for the murdered bishop and the pain it is very obvious it is causing the Coptic people and their Church, but I am comforted that at least
something is being done.
Just a counterpoint as to how other very hierarchical churches deal with their own problems. This is why I don't think the problem is in being hierarchical in itself, but in how the hierarchy responds. If the Holy Synod had not come together and issued its ban on receiving new monks, and gone with the order that all monastics get off of social media, and so on, then I'd feel much less confident that the leadership is taking this seriously.
2) It is true that sexual abuse exists outside in other religious denominations but I believe that it is unrealistic to insist a religion's legitimacy is dependent on the moral perfection of its adherents.
I hate to be crude, but not raping nuns and children is not a matter of "moral perfection" -- it's not being a monster.