It is so ridiculous that the exact same discussion has to be repeated again and again. The arguments haven't changed. "Bad thing is happening and we need this to ensure it doesn't anymore". The bad thing changes to what's currently the most popular threat although protecting children is obviously an all-time favorite.
I think the next angle will be that it's needed to prevent hate speech. Any other ideas?
There needs to be an international human rights treaty that enshrines the right to end-to-end encryption. Law enforcement all over the world already has more than enough power to do their jobs. If they cared about protecting people, they should be embracing the wide availability of strong encryption with open arms.
It's time politicians spent time increasing accountability and preventing abuse before they even think about granting more power to law enforcement.
They never needed to go to a "next angle"; the "protect children" has almost always worked (with the occasional "prevent terrorism" thrown in for diversity) :)
You don't need to change the angle, you just need to keep trying until the people's views align enough to get it through. "Never let a crisis go to waste", and such.
Counter-terrorism, criminal investigations, national security, cybersecurity, anti-corruption, regulatory compliance, breaking up organized crime, stopping drug distribution and trafficking, stopping black market trades (weapons, human trafficking, and the aforementioned drugs), stopping production of illegal materials, preventing insider trading, detecting fraud, stopping money laundering, preventing corporate espionage, nationalistic thought-police stuff that some countries legitimately want, stopping identity theft, political back channel interference prevention, social stability (someone might incite unrest), economic stability (someone might share ideas bad for the economy), public health safety (someone might share anti-vax ideas), gang activity prevention, stopping cults and sectarian violence, scam/fraud call and message prevention, disrupting ransom schemes, preventing propaganda, stopping environmental crime, disrupting illegal immigration, military and government organization advantage against allies on whom they can spy if they pressure them into abandoning E2E... oops I mean... peacekeeping, preventing the undermining of democracy (or the fatherland/motherland for those of the authoritarian inclination). There are definitely a few bingo cards worth of possible excuses.