"Pressure groups and movements have deepened democracy." How far is it true?

Pressure groups and movements have deepened democracy in the following manner:

(i) Pressure groups and movements can easily put pressure on the government to pay attention to them.

(ii) The government can often bend under high pressure from a small group of rich and powerful people.

(iii) Public interest groups and movements perform a useful role in reminding the government of the needs and concerns of ordinary people.

(iv) Sectional interest groups also bring pressure on the government to make policies in their favour and some other anti-groups can pressurise the government not to make policies in favour of the former group.