Bard's spells and how some of them can "assist" the enemy

I am concerned about Bard's spells and how some of them can "assist" the enemy. To start off I'm just gonna say that I'm fairly new to LoL so if I get anything wrong please feel free to correct me. Now to his abilities:

1. First of all,probably the most obvious one is his E: "Magical Journey" : There is a fair share of trolls out there and I feel like these trolls playing as Bard will be going around the map placing E on places that would help the enemy acces low health allies or just in general will try to ruin your day.(Imagine if you were recalling and an ally Bard who is being chased by the whole enemy team places the exit near you...)
2. His Ultimate R: Tempered Fate is basically an AoE Zhonya's and since the enemy doesn't take damage either people will be able to use it on enemies to save them / on allies to prevent them from getting kills / killsteal them while they are frozen or while running from the enemy team placing it on a low health ally and just leaving him behind for the enemy team.
3. The least obvious one is his W: Caretaker’s Shrine but if a Bard places this near a brush or near Teemo's Shrooms,Heimer's Turrets,Shaco's Boxes,Etc. And a low health ally tries to grab the health he would just be a free kill for the enemy.

Now I understand that these abilities are not meant to be used this way but since every now and again there is this smurfing troll just trying to ruin your promos...I feel like there should be something altered about this.

I also think Bard will be a troll pick and will have a huge ban/pick rate unless he gets a nerf.