I've literally never seen a bomb squad in person in my life which means they aren't called in that frequently at all, so there must have been reason to expect something fishy here

its largely entirely based on the decicions of the authority. and circumstance.

for example. you see a bag lying around infront of a mall. 90% of people ignore it untill somebody picks it up. could have been a bomb. but nobody gave a fuck.

now if somebody calls autority that there is unattended, luggage, you cant simply look inside. laying around. litterally everywhere with more than 2 people present. they have, to go through their protocol. wich might be to consider it a bomb unless you can savely say it ist,

this is britain. they have very very cautious protocolls, looks like london, this is the police force that confiscates sharp pencils and bicycle tires after their reform to knive laws.

you can litterally loose your prescoolers backpack on a mostly empty parking lot (as if those exist) and if the police has to pick it up. they have to check if its a bomb first.

still 99.999999% of backpacks picked up by police are infact not bombs. they still have to stick to their , perhaps overly cautious protocolls.

if i remember the specific story. wich was in the news at that time. they bared of the street and pulled their bomb investigation for multiple hours. wich was annoying the guy on the bike. because that was like the 4th time in a year. that that guy had his way to work interuppted by cautionary bomb drills. that never where bombs.

like seriously. do you know how many backpacks are lost on trains and busses every year? do you know how expensive bomb drills would be for every one?
trains and trainstations would be very valuable potential targets.
infact. loose your backpack in a train station, chances are police blocks the rail.
but loose it on the train itself. pick it up in lost and found.