People like your MP have a negative view on cycling full stop. If they had a positive view, they might consider that RLJ / no light cyclists are an issue, but not one that dismisses the policy and concept of encouraging cycling. They are using the antisocial activities of some people to justify a stance, and it doesn't stand up to scrutiny.
Would you MP also think that funding an area for regeneration, for example, is pointless unless they reduce crime (for example vandalism, graffiti) to zero? Or that debating and implementing road policy for motoring isn't worth while whilst some drivers flout laws such as speed limits, insurance and tax requirements and so on?
Fundamentally, if we need to wait for every cyclist to obey every single law flawlessly before considering improving the lot of cycling in the UK, then we may as well give up now.It is as impossible as waiting for every driver to follow the highway code to the letter or for every citizen to obey the law before enacting policies to benefit them.
The debate isn't about law breaking cyclists. If your MP wants an EDM on this, then I am sure he is welcome to raise it. It is about improving conditions on our roads for the majority of cyclists.