I think someone who has raped and murdered two people should definitely be locked up forever. The poor girls will never get another chance at life so why should he? His crimes were monstrous.
So were many & they only served a year or two, I would be far more worried about a sex offender still in his twenties, thirties or forties than a near pensioner. Reality is he was sentenced 15 years before the UK law changed to allow stiffer sentences. The UK has very few whole life tariff convictions & they are reserved for even worse offenders than the likes of him. He has served well over his 1988 sentence & still might not be released anyway. If he does then he will be under licence for life & any breach will see him back in prison.