When terrorists, child grooming gangs, people smugglers, people traffickers and drug suppliers/dealers are able to use electronic devices with impunity due to electronic device manufacturers designing strong hardware and software encryption and security into their devices then governments will act to stop that impunity.
For generations the UK has suffered numerous terrorists acts by the IRA and still do to this day as well as terrorists acts by other groups and thus the UK government will do what is necessary to protect it's citizens. Apple and other manufacturers think they are doing everyone a favor by beefing up security in their devices but when that security is used to help cause death and destruction, governments and security services/authorities will act whether we like it or not.