[It's unsafe to] drive at a speed different from everybody else.

For whom is it unsafe? Certainly not for children on the road. Besides, if everyone was speeding to such an extent that abiding by the speed limit causes accidents, the fines need to be much bigger. The most effective fines are those based on income, don't you agree?

I have to worry about inadvertently exceeding the speed limit by 1mph for a few seconds.

No you don't? Firstly, in countries caring about safety, your speedometer's indicated speed is never less than your actual speed. Since manufacturers would be fined even for a -1% difference, all speedometers show a slightly higher speed compared to your actual speed.

Secondly, where I'm from, speeding cameras will not be set off for speeding 1 mph. Their tolerance is 3 kph for speeds lower than 100 kph and 3% for speeds higher than 100 kph.

Those simple adjustments make you not check your speed constantly. In a 30 kph zone you will probably not get a ticket even if your speedometer shows 35 kph.

Speed cameras are nothing more than a way for cities to spend less money on highway patrols.

What even is the purpose of highway patrols? They're dangerous and ineffective because you'd need cops everwhere. And since cops already have a bias towards minorities, not everyone is affected the same way. Speeding cameras do not discriminate, do not kill and do not waste money which could be spend to improve the city.

Speeding cameras are the safest and single most effective method of forcing drivers to abide by the laws. Source
Most signifcant result:

Speed cameras alone were associated with a 19% reduction in the likelihood that a crash resulted in an incapacitating or fatal injury

Keep in mind the study focuses on a school zone. Who do you think were the ones being injured?

Are you insinuating that you're okay with people being injured or killed, as long as they happen to be inside a vehicle at the time?

Say there are n crashes at equal speeds, where a is the number of crashes between 2 or more vehicles and b is the number of crashes between vehicles and bicyclists or pedistrians and n = a + b. Let's assume n was constant. What results in less death and injury: a < b or a > b?