Does global political changes impact?

For a common man belonging to any country, who is following a routinous life, happenings around her/him or political happenings within thie own country really impact? How?

- What kind of involvement can she/he have?

- Does bothering about political arena benefit in anyway?

- Long term isolation from happening around the world might impact but do people really care? if yes whats one thing they have done to make minimal impact on something they are unconvinced with?