Harder to raid when ninja event is near?

I notice this almost every time when ninja event is near. Nothing has changed on my side and it’s much harder to succeed.

Is it just me? or Flare made it harder just before the ninja event?

I think it’s just that ninja events come right after a war, thus alliances will have more towers/troops boosted than normal. So, yes, definitely attacks are harder before the ninja event, but not too hard, in my opinion