It's fine if you downloaded it from official place. Sometimes warnings are shown for apps which are patched or forked from original. If it's the offical place then don't worry
In a democracy, if there is no alternative we have to vote for the lesser of the evil.
It's better to keep things worse, than to make it more worse, if there is no alternative. If an alternative is there, then absolutely. We should all be encouraging an alternative system in a democracy. But if nothing's is available, then this.
Wait what?