My game missing that big red structure at launch site.

[FreedomFighterEx]

don't know what it call, it used to be there before but now it's gone.

no ideal what can cause this.

[AlexL]

The 0.19 update removed the launch tower, apparently people didn't like it auto-exploding large rockets during loading.

[Mode7]

Oh you mean the 'rocket width inhibitor.' Sounds like a serious problem.

[OdinYggd]

The launch pad was redesigned in 0.19 to be without a launch tower, as it had become the source of complaints with rockets striking it and exploding.

Plus the new pad is now wider, giving more support to large craft.

[Kerbface]

Yeah, I don't think the launch tower served any purpose, though I believe in real life it's used for getting crew on board? Or is it designed to stabilise the rocket before launch or something? Not sure.

[Geredis]

Basically...both, but the stabilizing launch towers you add (which now actually explode instead of standing there after being decoupled at launch) supposedly serve that same purpose, and indeed I simulate it by adding several around the base of the engine for stability and then one asymmetrically attached right over the crew hatch of the command module.

[Koosmonaut]

I thought my game was bugged, cause they exploded lol

[Pleborian]

couldnt help but lol when I saw this topic yeah the launchpad had a redesign and now looks ALOT cooler

[TooManyErrors]

I believe that a functional launch tower will be added later in the game, but don't quote me on this.

[FreedomFighterEx]

so it was remove on purpose? alright then.

[EndlessWaves]

I thought my game was bugged, cause they exploded lol

More likely you're either hitting them with the rocket exhaust or you're using one of Romfarer's mods (Lazor, canadarm etc.). They still behave exactly the same as normal in stock 0.19.1 and don't explode.