Why is it okay to fly the Palestinian flags, Hamas and PLFP flags in the U.K?

I'd like you to look at this video and ask yourselves why the United Kingdom allows the flag of terrorist organisations Hamas and the PFLP Popular Front for the Liberation of Palestine flag to be flown at Anti-Israel demonstrations, yet the flag waver isn't arrested, under a public order offence, even though it is highly offensive to Jewish people countering Antisemitic demonstrations?

Have the laws changed to fit a political narrative ?

It took years for the flag of Hezbollah to be banned and to be an arrestable offence at the yearly Al Quds March in London, despite numerous complaints and letters from pro Israel activists.