If I get home at 7 and it's dark then it doesn't really lend itself to going outside.
In daylight savings I still get home at 7 but now there is an hour of daylight left.
So even though there is still the same amount of daylight in the day, due to the rescheduling of the work day with respect to daylight, there is an extra hour of daylight in the evening
Nowadays I work for myself, so yes it is easier to redefine my office hours. Changing the office/school hours of all my friends/family/children however is not feasible.
It really is an all-or-nothing sort of proposition. Can you imagine for example if half the businesses in an area ran on 9-5 and the other half ran on 8-4? You would get far more chaos than the minimal disruption caused by DST.
Now you might argue that society shouldn't be run based on the whims of people who want daylight in the evening, and you'd have a fair point. The counter to that is that likewise it shouldn't be run based on the whims of people who don't.
Luckily I live in a democracy and if, based on the will of the people, the state government where I lived decided to rescind DST then so be it and while I wouldn't like it, I would accept it.
However, I would wager that the majority of people where I live prefer daylight savings and so having it is the will of the people.
If "the evening" refers to the period when the sun sets, then DST doesn't change anything. You still have so much daylight, no matter how you set your clock.
