Yes, trust is important. It is strange that the quality of the website management is the opposite of the program itself. The quality and usefulness of the program are well known for many years, and no one noticed anything suspicious about it. In the meantime, we have some other trusted programs like IOBIT, CCleaner, and some trusted web browser extensions that made many people infected.
Anyway, caution is required, and using the HTTPS website is recommended.
People should also remember that ShadowDefender can only protect the disks against permanent writes. The changes are virtual and temporary (discarded after the computer reboot). Until reboot, the malware can be installed and the data, passwords, secrets can be sent to the attacker. The malware can still infect the disks not protected by shadow mode, USB drives temporarily connected to the computer, devices connected to the local network, and data located in the personal cloud storage.