Because Gaza is not in the UK and Grimsby is.
The government should have a position on Gaza for sure, but its priority is here, first and foremost.
Here is a list of countries where conflict, war and starvation are presently at a critical point.
There are thirteen in all, there are more....
https://www.concern.net/news/countries-in-conflict
With the exception of Ukraine that directly effects our safety, not one of these conflicts should be more important than Grimsby for any UK political party, with the possible exception of the Greens, and certainly not for a party that ever wants to be in government.
As for the ideology of immigrants? Have you been drinking? I sometimes post when I'm pissed, it's never a good idea, but this is next level.