This was to disprove the straw man argument that if you are sympathetic to Palestinians you are automatically a Hamas supporter.
But even though the number of people who agree with Hamas philosophy are relatively small compared to the entire population, their numbers are non-trivial:
5% of all British people say the October 7 attacks were justified. 5% support ethnically cleansing Jews from the Middle East.
Of course, among the people motivated to join anti-Israel rallies every week, the percentages are much higher. After all, anyone who calls for a "flood" or "resistance" or "by any mean necessary" is agreeing with Hamas.
But imagine how British Jews feel when they know that in any given crowd, on the streets or on public transportation, there are likely to be several people who want to see them dead and who would celebrate their deaths if done in the name of "Palestine."
The 5% number is interesting for another reason. That is roughly the percentage of British adults who are Muslim.
Iran has been recruiting British Muslims as spies against the British Jewish community.
No wonder interest in making aliyah to Israel is now at record levels among British Jews.