Paraview not accessible from other accounts
There is nothing wrong with your installation method. A lot of apps are intended to be installed by just simply dropping the app on the Applications folder.

Now either the packager/creator of the application bundle in the dmg made a mistake or the permissions of the bundle are deliberate.

To allow other users to use the app, modifying the permissions with the following command should be sufficient:

sudo chmod -R u=rwx,go=rx /Applications/paraview.app