I think this is likely too critical of this approach, given that this sort of thing already happens and works. Arguably, the mass-joining of Labour by Momentum is exactly ‘entryism’ of this sort. Such entryism was perhaps in bad faith, but conspicuously (a) this does seem to have changed the UK political landscape and (b) there haven’t been serious attempts to stop it. I don’t have a strong view on this, but it doesn’t seem unreasonable for someone to claim “this happens anyway, it won’t make things worse if we do it, we might as well do it too”.
I think this is likely too critical of this approach, given that this sort of thing already happens and works. Arguably, the mass-joining of Labour by Momentum is exactly ‘entryism’ of this sort. Such entryism was perhaps in bad faith, but conspicuously (a) this does seem to have changed the UK political landscape and (b) there haven’t been serious attempts to stop it. I don’t have a strong view on this, but it doesn’t seem unreasonable for someone to claim “this happens anyway, it won’t make things worse if we do it, we might as well do it too”.