Bitcoin is a community driven project and as such needs the community support for it to continue growing, newer investors joins the community and it has an effect on the price. Without the community, Bitcoin is nothing, so I wouldn't agree with you that it grows without getting support from anywhere.

The Bitcoin community is made up of people who value decentralization and censorship resistance and who engaged in it both as a hedge against inflation and investment opportunity and this provides some of the backing that Bitcoin needs to keep growing. Bitcoin is the future of money and the more it's adaptation, the more the support it needs to continue growing increases.