We live in a society, I don’t see how giving out basic information to law enforcement with a court order is somehow a fault of the company - first of all, your mobile service provider knows orders of magnitude more info on you (and quite likely sells it as well), second of all, your employer will do the same without a second thought as well as your bank, etc.
Then, just share a few of them, not a big step but it starts the machine of making it easy to share more and more little by little.
First IP, then IP and phone nb, then IP, phone nb, and connection log, then IP, phone, connection log, and geodata; then IP, phone nb, connection log, location data; then IP, phone nb, connection log, location data, contacts; Then IP, phone nb, connection lots, location data, contacts, chats ...
If you look at the "because terrorism" reason, it can apply at any of these data.
No one will say: we think they are terrorist, share their IP but not their location or their chat.