Crime has generally been reducing in London irrespective of LTNs. the metropolitan police crime map lets you look at data from particular postcodes and particular crimes.
If you’re talking mess on that corner, I think the dumping of stuff by the old electricity substation Is far worse, especially as it got a 10k greener fund awhile back
Different people have different ways of dealing with difficulties. Your way clearly suits you. However the very recent Casey report highlights major difficulties of the Metropolitan police. The 'processes in place' are not working.
It always interested me why the only gate open to car traffic was in the privileged Dulwich village car free area.
I remember at the time people with disabilities could no longer enter and park inside their nearest gate.