Not sure what your point is... Influences from flags are often part of Eurovision logos
The Star of David is a LOT more than an influence from a flag... It is a much more powerful symbol than just that.
The Eurovision Song Contest's only interest in perhaps utilising a 6-point star symbol for the branding of the 2019 event would nevertheless be because it happens to be on the host country's flag, rather than because of anything to do with Judaism and/or implying any opinion regarding the long-standing Israel/Palestine sensitivities etc.
You talk about the contest as if it's a person or a single organisation though? The reality is that the contest is the product of the production team making it that year (with some heavy steering from the EBU). This year that production is through KAN - the Israeli Host Broadcaster - and so they will be more than aware of the symbolism over-and-above the flag - as of course will the EBU.
The EBU is very aware of sensitivities in this regard I'm sure - with recent issues to do with prospective participants refusing to broadcast the Israeli entry.
If the UK were ever to host the ESC in the future (which would presumably be after hell freezes over?!), and if that year's ESC logo was based in any way on the Union Flag, that would not mean that the EBU are suggesting any opinion regarding the Union (e.g. versus Scottish independence etc).
Yes - and there was a bit of a kerfuffle a few years ago when Scottish, Welsh and English flags were not on the 'approved' flag list...
However the Star of David has much more profound symbolism, and on a wholly different level, to that of the Scottish independence referendum. Particulary in relation to Nazi Germany.
I'm not criticising its use as a symbol, nor am I saying it shouldn't be used, but I think it's incredibly naive to think it's just a nod to the national flag. A symbol so loaded with heritage and meaning is never likely to be just that.