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One of my closest friends is a senior civil servant who transferred into the civil service from the military and occsionally works in Downing Street.
The issue of this supposed security threat is what winds him up most. To paraphrase him, "driving to your parents house for your mum and wife's birthdays is not on the list of sanctioned actions for staff who are close to the PM and feel under threat".
We also knew where Boris Johnson live before, and he have a lots of enemies also.
People weren’t shouting at him outside, he was shouting at people inside.
If safety an issues; the government would know about it, or at least should to ensure their staff is safe.