While proportional representation is a more fair system because it provides equal representation to everyone by taking population density into account, it does not change social attitudes or individual behaviors. Engagement in politics is controlled both by individual interest and media coverage of the political issue or event, which is what keeps many informed of current issues.
No, proportional representation does not, by itself, result in greater public engagement in politics, because individuals from small areas with unique interests are unlikely to participate. The people living in rural areas or small states might feel that they have no influence. In a directly proportional system, people from largely-populated areas can vote for the small areas to be taxed more heavily.