That is a good point. There is tendency to discuss parts that are the problem. I don't have conclusions about religion as a concept because the issue is complex, and there is a reason these structures evolved. It does have to do with group cohesion which is part of human survival and the basic way that humans function. Social cohesion does involve both charity (mutual support) and social controls. Some can be argued to be necessary for social functioning.
Sometimes vulnerable populations do attract individuals and structures that rely on control to function. It is also related to parenting instincts, I think. Working with some special needs populations has introduced me to charitable, but highly controlling individuals. It also has to do with attempting to protect people. The converting mindset can be an attempt to protect the person's eternal life. Sometimes these can also be charitable, but there are always degrees of both elements.
Our society really needs a better sense of boundaries, especially today when we share the world with so many groups and individuals.
The exploitation of avenues for care by control freaks is definitely a thing, not just among religiously motivated individuals, sometimes its even an unconscious thing.
I personally do not espouse an evangelical mindset, in terms of religion or any of my other opinions, most people that I do find who do it is about a sort of need to have others share their opinions and some how they trust their opinions more when others do share them. I've never really felt like that.
It could be to do with protective inclinations, I find this strange as most of the individuals I have encountered who have espoused the evangelical mindset have, when I've probed them about their beliefs, told me that they believe in predestination, election of exclusive groups on individuals, fatalism about life, death and eternity. The professing of any opinion then, whether its private conscience, personal conviction/witness or evidenced through motivation, words and deeds, it is really all besides the point anyway.
There was one individual I met who told me that their attempts to convert others where a product of their anxiety about abiding by instruction from their scriptures, it told them to spread their word and they felt if they were remiss then they would be punished by God. These sorts of things I dont believe matter to God, they are human all to human and a result of conscious and unconscious human drives or contexts for the most part.
Sociological, anthropological, naturalistic or psychological explanations of religion are interesting, I dont think they are the whole story personally but I dont need anyone else to share my opinion either. As I understand it religion should provide relief from avoidable suffering and help with coping with the unavoidable suffering of life. It should. I know people use it as a flag of convenience to satisfy drives to control too. It happens.