In general, the government wants to hear the opinions of various industries or interest groups when discussing things that affect them. Furthermore, if the poli

In general, the government wants to hear the opinions of various industries or interest groups when discussing things that affect them. Furthermore, if the politicians have decided that they want to implement a certain change, the details of that change need input from that industry or interest group. For example, some representatives may have a general political position that they want to protect local industry from overseas competition with worse standards. There is a valuable role for a lobbyist to come and say "hey, you have taken measures for the steel industry and honey imports, but what about us, the widget industry as represented by ACME inc. also is relevant your goals!" - and if the representative agrees that this should be done, it makes sense for them to ask the lobbyist / the industry to make an exact proposal to how different types of widgets should be defined/distinguished in that new law, instead of having it be written by some staff paralegal who doesn't understand what the industry is about and what those terms mean.