I do think Miriam attempts to engage in real debate and having watch a documentary she did where she travelled across the US, I think she's genuinely interested in different points of view. I also admire her ability to be as forthright as she is, and she has spoken out against the Gazian genocide several times.
I can see why she's become an attractive figure for TV execs to bring on screen but in doing so there's an inherent condescension. They see her shocking statements and stories as funny coming from a 'fat little old woman' and invite us to laugh at her, in the way we do Catherine Tate's Nan.
What people are now seeing is that condescension can't hide the very real racism in her statements, whether that's unconscious or not, and some could argue execs have a duty of care to those of minority groups, such as Andi Peters, not to put them at risk of being on the receiving end of an -ism on air.