In case you still want to argue/want some
Keep in mind, this suggestion does not pretend to be a comprehensive solution. It aims to resolve single issue - VIP suicide runs.
Step 1. Make VIP invincible
No more "VIP into firing line", no more random fastmovers killing VIP, a lot less randomness in that regard.
Step 2. Turn VIP into walking domination area/capture point.
Since there is no more "destroy VIP" objective there should be a different goal for attacking side. There is sort of OK Domination gamemode, there is tried&true Conquest capture mechanic, both of them can be utilized with or without adjustments.
From the gameplay perspective twose 2 steps alone provide the following:
1) give defenders more reliable way to defend VIP (conquest/domination rules to prevent capture)
2) give defenders more time to react to the threats
3) give attackers reason to play the game instead of playing target practice
4) obviously, VIP can't make kamikadze charge anymore
Overall they give players a lot more power to influence the match result.
Thoughts & constructive critisism are welcomed. Spartan out.