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But they never attack us - they only attack the (yellow) structures (bee hive), making it even harder to target them.
Not sure I understand you - what would that achieve? Do you mean invulnerable until close enough, then red?What they should have done was made them Invun like they do with other enemies till they get there.
I think because they are yellow, many will ignore it. or run where they are going to get the event. If they were red, they would accidently attack them because of how you can select closest enemy.
They would start out red not yellow, but have the blue life icon for Invulnerable till they are within range. This would solve the issue outright... but making them be red!