The business I work for has an arm that provides security and after the social media sh*t storm after the awful Southport attacks in 2024 had to provide emergency security at Muslim schools and places of worship.
While there are definitely people planning to attack Jewish sites, and security is needed for that reason, I think it's far easier for someone to use social media to raise a mob against Muslim people. Yes, I have absolutely sat in synagogue and wondered what I'd do and how I'd get out if there were a terror attack. But I don't have to worry that someone on X is going to rustle up a mob to a harass and intimidate us, because there's no popular appetite for that anywhere.
And before anyone says it, Palestine solidarity marches are not 'a mob against Jewish people' - the police (not the organisers) routed that march on a road parallel to a road with a synagogue, along a standard large protest route, and no one broke off from that march to harass or intimidate any shulgoers (because we certainly would have heard about it if they had).
The police have not had to be called to prevent attendees from harming any Jewish people - the only time there was a confrontation was when some guys from the pro Israel counter protest, against police restrictions, came to part of the march to try to make a scene with participants.