Citing complexities all the time is just a tool for obfuscation and a justification for inaction.
Sometimes things really are that simple: mothers and babies in warzone situations need access to humanitarian aid that will save their lives and they are now at grave risk.
This is really not too complicated; Israel are placing unreasonable demands on NGOs that will put the lives of their volunteers at risk, and they are refusing to facilitate discussion to enable them to provide life-saving care. Multiple international organizations and countries have said as much out loud.
Israel of course could provide maternity and neonatal services directly themselves, but they are not doing this are they? Why not, if they won't let services in and this is happening under their watch?
Of course any reasonable person should speak up about this, and it is reasonable to ask Justine, as a previously-demonstrated influential political figure and founder of the largest parenting forum in the UK to speak up as well.
If she can't speak up as a representative for Mumsnet because a sizeable portion of posters here have apparently fallen into a moral abyss where the lives of mothers and babies in another country apparently don't matter, she should speak up for herself, recognising that she is an influential public figure with relatedness on this issue, and there is responsibility that comes with that.