Allow the pensioner who stabbed an intruder to be released without charge.

Officers were called to reports of a burglary in progress after two men entered a house in South Park Crescent in Hither Green, south-east London, the Metropolitan Police said.
One suspect, armed with a screwdriver, forced the 78-year-old home-owner into his kitchen when he discovered them.

We can't accept your petition because the UK Government and Parliament aren't responsible for the issue you raise. The police and the CPS are responsible for deciding whether to charge people with a crime.

You may find this guidance from the Crown Prosecution Service helpful:

https://www.cps.gov.uk/publication/decision-charge